FP: "Son, listen to me, I’m gonna do what you want. Get my act together. I’m gonna get your mom and Jellybean home so we’re all under the same roof, I promise. But I--I just need a little time to do that, not a lot--not long, a month, two at the most. Hey, then we’ll be back on track, alright? You, uh, you believe that, don’t you?"
The father-son relationship between Jughead and FP Jones is strained but ultimately loving. Due to FP's alcoholism, Jughead moved out and their family quickly fell apart, however, Jughead still hasn't lost hope for his father. FP is trying to change for the better, in hopes of reuniting their family once more. He quit drinking, and even cleaned up, to prove to Jughead that he can change. However their happiness was sort lived with FP was framed for the murder of Jason Blossom. Even after he was proven innocent, he was still considered an accomplice and was charged for withholding evidence. As a result of this, he is facing some tough charges, sentenced to due time in prison.
The Jones family always had trouble at home, which Jughead mentions as a cause for hating his birthday. Their troubles were exacerbated when FP began drinking heavily during his unemployment. Jughead's mother and sister moved out to live with their grandparents, and Jughead began living in the Drive-in.
Their relationship as father and son was first known when the Twilight Drive-In, Jughead’s place of employment, was closing down. Jughead learned that an anonymous buyer had plans to tear down the local drive-in, and he fought desperately to keep it open. However he failed and it was revealed that Jughead had been living out of the projection booth.
He met his father outside, who was a member of the the local gang, the Southside Serpents and they had a short strained conversation. His father asked "So where you gonna live now?" and he replied, "I'll figure it out, dad. I always do." After that was said, he walked past his dad and left the drive-in.
Archie learns, after bumping into him in the boys' locker room early that morning that ever since the drive-in closed down, Jughead had been living out of a forgotten closet under a staircase at the High School. Jughead explained that things weren't good at home. His dad had fallen off the wagon after Fred Andrews fired him, and his mother had left with Jellybean to live with their grandparents a while back. Archie invited him to stay at his place, but he declined, saying that his situation was only temporary. Archie then spoke with his father about the situation and Fred offered to call FP about getting his job back.
Jughead visited his father at his trailer to talk about the job, and FP was happy at his return. Jughead insisted on FP getting rehired at Andrews Construction and start rebuilding their family, to which FP seemingly agrees and speaks to Fred. To celebrate FP returning to work at the Andrews Construction, Jughead, Archie, Fred and FP go to Pop's for dinner where the two fathers told stories about their younger years. When it came time to pay, Fred and FP got into a dispute over the check.
Later that night, FP and Jughead practiced music with Archie, where FP complimented him on being better than his father. He then revealed the truth about why he was forced to resign from Andrews Construction to Jughead and Archie, much to their horror. This left FP very upset and he began drinking. Jughead took his father home and put him to sleep on couch where he mentioned to his father that he spoke with Jellybean over the phone. She wanted to be addressed as 'JB', instead of Jellybean because she thought it sounded cooler. He remarked that she's a "ten-year-old who listens to Pink Floyd on vinyl, how much cooler could she get?" Jughead also mentioned that his mother now worked at a call center and is taking online classes in the hopes of finally getting her GED, which Jellybean helps her study for. However, Jughead then noticed that his father had passed out while Jughead was helping take off FP's boots and hadn't heard a word he'd said.
The next morning Jughead was brought to the Sheriff Station by Sheriff Keller as a suspect for Jason's murder. His and Betty’s fingerprints were found on Jason’s torched car as expected, but Jughead had a surprising juvie record from six years prior when he almost burned down Riverdale Elementary School, which, according to Jughead, was an accident; he was just playing with matches. Sheriff Keller unfairly suspected him as the killer due to his background and being from the ‘wrong side of the tracks’.
Fred came to his aid and told Sheriff Keller that Jughead was tearing down drywall for his construction company on July 11th, which Fred and Archie later falsified a time card to prove. Jughead’s father showed up to the station just as everyone was leaving and caused a scene in front of Fred, Archie and Betty. FP was furious and angrily demanded to see Sheriff Keller for making accusations against his son and even lashed out at Fred, who tried in vain to calm him down. FP angrily pushed Fred and stated that Jughead was his son and Fred would do the same for Archie. Jughead convinced him to let it go and before he left, FP tearfully promised he would get his act together and that they would have their family back, it would just take some time. Jughead looked angry and resigned as he told his father he believed him. In the end, Jughead went to live at the Andrew’s house.
After Archie revealed that FP was a Serpent having found out when he visited the Whyte Wyrm bar, hangout of the Serpents, Betty wondered why he hadn't told her and he admitted that he was ashamed of his father. They then went to visit FP to ask about Jason Blossom as they had learned from Polly that Jason was running drugs for the Serpents. At the trailer park, after initially trying to deny the gang dealt drugs, FP divulged they gave Jason some product to deliver upstate, but when it never showed, they assumed he had run off with it, until his body washed up at Sweetwater River. Jughead then braced himself before asking his father if he had had any involvement in Jason's death. Hurt, FP asked if Jughead really thought he could do something like that but Jughead didn't know what to think anymore. FP acknowledged that he was a lousy father, but he insisted that he wasn't a killer. Outside the trailer, Betty asked if he believed his father and Jughead admitted that he did.
On the eve of his son's birthday, FP received an unexpected call from Betty, wondering if he would like to join them for a surprise birthday movie and dinner. However, FP knew that if there was one thing that Jughead hated more than surprises, it was his own birthday and thought it best if he kept his distance, that that would be the best gift he could give to his son. Much to FP's surprise, Betty showed up at his work the next afternoon to insist that he join them for the small party they were going to have at Archie's house. Betty wanted to do something special for Jughead, and she believed his presence would be special. Realizing that she would not let up, FP agreed to attend Jughead's party.
The following night, as promised, he came to the party, only to discover that it was a wild house party and that he was the only adult in attendance. Gift in hand, he entered the garage to find Jughead and Archie conversing, and before leaving to put his gift in the den, commented that Betty had invited him, and that she knew what she wanted, meaning Jughead.
Later on, FP kept quiet and watched as the teens played a game called "Secrets & Sins", in which they would reveal their own secrets, however, the game quickly escalated as punches were traded between Jughead, who was defending Betty, and another guest, Chuck Clayton. FP quickly stepped in, grabbed Chuck by his shirt, and manoeuvred him bodily out the house, declaring to the rest of the teens that the party was over. He confronted Jughead as he attempted to leave the house and told him not to run away. FP could see that Jughead had a good thing going with Betty and his friends, something he could never give him and he needed to man-up, and talk to Betty. Convinced, Jughead returned to the house.
Jughead visited his father one morning, bringing coffee and doughnuts to his trailer, and was happily surprised to find the place clean and tidy. FP had even shaved. FP revealed that he had read Jughead's manuscript on Jason Blossom's death, pleasing his son who did not think he would actually read it. FP was very impressed, claiming Jughead had a gift. He then asked why Jughead had chosen to write about a dead kid, and Jughead told him that, as an outsider in Riverdale, he could tell the story that no one else would. FP then asked who he thought had killed Jason, however, Jughead thought the right question to ask would be if Riverdale was still a place of good, or a place of darkness and evil. FP then remarked that most things are both and suggested that Jughead eventually move on from Jason, and not let his story be the only one he told. That night, Jughead discussed his father with Archie, happily telling him that his father was doing really well and suggested it was time he moved back home. However, Archie tried to convince him to hold off as he and Veronica secretly suspected FP of murdering Jason Blossom on Hiram Lodge's order.
Jughead and FP were later invited to dinner at the Cooper house before the Homecoming dance. However, the evening was tense as Alice spent the dinner questioning FP about his involvement with the Serpents and Hiram Lodge. Alice also had her suspicions about FP and while Jughead and FP were at her house, Alice had secretly tasked Veronica and Archie with searching his trailer. To get back at Alice, FP began to tell Betty and Jughead of Alice and Hal's homecoming dance, during which he had overheard them having a heated argument, which sounded like life and death. Alice angrily told him to shut up and FP obliged, warning Alice not to jerk him around in front of his son.
FP dropped Jughead and Betty off at the dance, but before Jughead left he told his father that he wanted to return home and live with him once more. Happy, FP suggested they get their whole family back together and move to Toledo to be with Jughead's mother and Jellybean, much to Jughead's surprise. After the dinner they just had and Jason's murder, FP thought it best they leave, as Riverdale chewed up people like them. Jughead later learned that his friends suspected his father was a murderer as well as searching his house and shortly afterwards was informed by Kevin and Fred that his father had been arrested for Jason's murder. He was left devastated as he had truly believed his father when he had said he was not a killer when Jughead had asked his father himself, weeks before.
After his father arrest, Jughead and his girlfriend are seen at Pop's after Archie's father was shot. Betty is seen talking to Jughead, as she informs him that she's worried for him due to his connections to the Southside Serpents. As she stated when he put on the Serpent Jacket, it fit him like a glove. While also adding that after he put the jacket on, the look on his face didn't look like acting. Jughead later tells her, as he defended himself. Stating that their was about ten Serpents standing outside of his fathers trailer, he couldn't say no. As he later admits to her, that it wasn't an act, as he stated that his father was going away for a long ass time, and riding his fathers old motorcycle, living in his trailer home, and being in the Serpents gang. It made him feel like he was still with his father, meaning that his father would always be with him, even if it meant that he would be behind bares for a long time.
Jughead: "What?! You want to give me some advice on my right hook?"
FP: "I want you to go back inside and talk to your girl."
Jughead: "I don't think it's going to work out...irreconcilable differences."
FP: "Don't—Don't run away from this! Don't run away. You've got something good here, with her, with your friends, something that--something that we could never give you. And also, man up. After what I just saw in there, she needs you."