Two years prior to the start of the series, Fred and Mary decided to separate and began divorce proceedings. Mary moved to Chicago in that time, and while she wanted her son to go with her, he chose to stay in Riverdale with his father. Fred and Mary's separation was not an amicable one as, according to Archie, they cannot even talk without a mediator present.
Throughout the SeriesEdit
In the beginning of October, Fred headed up to visit Mary in Chicago to finalize their divorce. Before he left, Archie wondered if maybe his parents could fix things between each other, as Mary had not mentioned anything about the divorce to him the last time they spoke. Fred was of the opinion that they were past the point of reconciliation and that Mary had not mentioned anything to Archie so that Fred would be left as the bearer of bad news.
Fred called Archie from Chicago who wondered if he had seen Mary yet, but Fred revealed that while they were going to have dinner, decided instead to just meet the next morning with their lawyers present. Upset that his parents couldn't talk to one another civilly, Archie cut the call short. Later, during Jughead's 16th birthday party, Archie drunk dialed his father and told him not to sign the divorce papers. The next morning, Fred came home with Mary in tow, much to Archie's surprise.