1.Patton didn't seperate the twins. I've seen many people say that he did but I think he didn't

2. The sides actually have parents. I know it sounds weird but it may answer to why the sides act a certain way like if something happened to their family

3.The reason the twins are seperated is because of their parents. Like they divorced and split the twins up and they both grew up to believe different thing

4. The day that they see Remus's and Roman's room there will be memories of them as children.