The mother and daughter relationship between Josie and Sierra McCoy is tight and close-knit. They care deeply for each other, as a mother and daughter would. Even though Sierra may be strict toward her daughter, it is only for her daughter's benefit.
Josie and Sierra have a good relationship, one that is far more developed than her relationship with her father, Myles McCoy. While they close and love one another, the McCoy women have been known to hide secrets from one another.
The family hosted a dinner where Fred, Archie, and Hermione were there as guests. The McCoys had dinner that night where Hermione brought up the topic where she was excited to watch her daughter Veronica perform with Josie and the Pussycats. When the subject was brought up, it appeared as Myles was surprised and unaware by the news of his daughter Josie and her band performing at the Variety Show, asking Josie when she was planing on telling him the news. As Josie explained to him it just happened, she was also telling her father how Veronica is really good and that Valerie had quit the band. He was disappointed to hear about the news as he said "she was the real deal, that she gave the band much needed integrity". After things got intense Hermione asked Fred to get started on his presentation of the SoDale project, while trying to persuade the mayor of giving him the job.
The following day after Valerie heard the news of Josie's father attending her performance she asked if she could join the band again. Especially when she knew she had to be there for Josie if her father was there watching over her. During her performance, her father left his seat beside his wife Sierra and left the show before his daughter even finished her performance. Heartbroken, she tried to stay strong while she was still performing with her band, after the show was over she left a little while after her mother came to comfort her while she was crying in the girls washroom.
Jingle Jangle Invading the Northside
Sierra and Josie were invited to the Cooper house by Alice after she discovered that Josie and several of her friends (Archie, Betty, Veronica, Kevin, and Reggie) attended a party at the Five Seasons, where Jingle Jangle was in use. Sierra thanked Alice for hosting the gathering as she agreed with Alice's sentiment of coming together, so that they could deal with the children's inappropriate actions appropriately. The get-together proved to be quite informative, having learned that Reggie Mantle supplied the drugs at the party, and that his supplier was a kid at Southside High, who he believed to be a member of the Southside Serpents as well as a student at Southside High. Sierra also learned that not only did Josie attend the drug fueled party, but that she participated in the night's events, despite knowing that her father struggled with addiction. Before leaving with Josie, as the Mayor, Sierra announced that moving forward, her number one priority was bringing the Southside under control, even if that meant razing it to the ground or arresting every Serpent in sight. 
Dreams and Death Threats
Josie arrived at Five Seasons hotel, the McCoy's new place of residence, to find her mother, sitting on the couch, awaiting her arrival. Josie was reprimanded for staying out too late, as Sierra explained that they'd moved out of their home because of the Black Hood and the dangers that they all faced while he continued to terrorize the town. With the letter that the Black Hood had addressed to the town of Riverdale, Sierra had become more cautious. Josie didn't see the problem with walking the streets alone and didn't feel it was necessary for a bodyguard. She wasn't Whitney Houston, Josie joked. Nonetheless, Sierra was concerned for her well-being. She set in place a curfew for Josie, who was to now return home before dark. Reluctant, Josie complied with her mother's wishes.
The following night, Sheriff Keller in tow, Sierra went out looking for Josie, who had failed to make it home before dark per their agreement. She and the Sheriff found Josie dancing in Pop's shoppe with Chuck Clayton, who the Mayor wasn't pleased to see around her daughter. "You're a damn fool", she stated upon entry of the establishment. She had sent Josie several texts messages over the hours, all of which went unanswered. Chuck interjected. Hoping to lessen to tension, he explained that he was just about to give Josie a ride home. However, Sierra didn't even want him within 10 feet of Josie.
They returned to the Five Seasons, where Sierra tried to make sense of Josie's recent behavior, concluding that she was merely acting out, which Sierra couldn't stand for, not with the Black Hood terrorizing the streets. Josie's dismissed the notion that she was acting out, claiming that she was simply living her life. Josie was reminded by her mother of all the people in Riverdale with hate in their heart. The same people that used to write her awful letters. Since the Black Hood emerged, the letters had gotten worse. It was almost as if they were emboldened by the killer. Sierra informed Josie of the recent death threats. The things that were being said were terrifying, such as threatening to slit her throat or cut out her heart. Some of the residents of Riverdale were monsters. To make matters worse, the last letter she got, mentioned her daughter. Sheriff Keller then asked if Josie had received any suspicious letters or packages recently, which Josie replied that she hadn't. Sierra had worked so hard to get them where they were at, to shield them from such hate. She then joined Josie on the couch, and held her close.
The following night, after Josie received a pig's heart as a gift, Sierra comforted her while Sheriff Keller confronted Chuck Clayton, the accused. Sierra was glad that they'd finally caught the miscreant that was behind those disturbing messages that Josie had been getting. Sheriff Keller had talked to him, and he promised he'd be leaving Josie alone. However, the Sheriff wasn't convinced that Chuck was responsible. After questioning him and checking his locker, they never found any evidence. Sierra instructed Tom to keep looking because if Josie said that it was Chuck, then it was him. Later on, Josie had a dream — she was back at the music room in school rehearsing a song, when the Black Hood approached her slowly from behind, turned her chair around and slit her throat. Josie woke up gasping for air in the middle of the night as she held her neck firmly. Hearing her daughter in distress, Sierra rushed in and held Josie as she tried to get her daughter to respond.
Season 1 Screencaps
Season 2 Screencaps
- ↑ Williams, Tessa Leigh & Zwart, Nicholas (writers) & Adelson, Steve (director) (March 2, 2017). "Chapter Six: Faster, Pussycats! Kill! Kill!". Riverdale. Season 1. Episode 6. The CW.
- ↑ Williams, Tessa Leigh & Anderson, Arabella (writers) & Kiley, Maggie (director) (November 15, 2017). "Chapter Nineteen: Death Proof". Riverdale. Season 2. Episode 6. The CW.
- ↑ DeWille, James (writer) & Wilkinson, Dawn (director) (November 29, 2017). "Chapter Twenty: Tales from the Darkside". Riverdale. Season 2. Episode 7. The CW.