Marie vs. Debra
Debra was abused as a child.By a man. Because of that,s he subconsiously took her rage out on Ray, because he is the closest man in her life, much like the man who abused her was.
Ray Barone cheated on Debra some time in the past and she uses this fact, along with his desire to keep his family together to torment and generally be as unpleasant as possible in every episode.Think about:Debra goes out of her way to browbeat and humiliate Ray almost every chance she gets. She won't have sex w/ him on numerous occasions and demeans even loving gestures from him towards her. Unless she is just an anti-social personality and in need of serious counseling (which she may well be) the only RATIONAL explanation is that Ray cheated on her in the past and she uses that fact to "punish" him at every opportunity.
At some point in the future, Ray and Debra will be the "New Frank and Marie."Given the way the characters interact, it's possible. Further supported by the fact that Marie has repeatedly hinted at the fact that her own relationship with Frank's mother was VERY similar to the present-day relationship between Debra and Marie. Then, there's the fact that Ray shares his father's talent for being a Deadpan Snarker, while Debra shares many of Marie's personality traits (desire to control Ray, among other things). Given these facts, it's really not that hard to imagine that a half-century later, Ray and Debra will seem virtually identical to present-day Frank and Marie.
Peter and Peggywill get married at some point after the finale They got together during one of the last few episodes of the show, so presumably they were still together when the show ended. Plus Peter clearly mentioned during the episode that he certainly wants to get married at some point. And Peggy was clearly enamored of his personality. So presumably they will get married at some point in the future, which means that Peggy and her daughter Molly, Ally's best friend, will officially be part of the family.