My boyfriend has a 5 year old son who I've known most of his life. Now that I have a son of my own (only a month old) I find myself fighting with my boyfriend because I have to take care of his 5 year-old. Is it wrong of me to not want to be responsible for his son and keep my attention and focus on my own son? Every time I get upset and try to talk to him he says I'm making him choose between his kids.