I really hate this "I want you to be with your family cliche". This isn't like Toradora where the family actually cares about him, or is putting in the effort, or her relationship would cause any problems. The siblings love her and a relationship would change nothing. The mother is always going to be a cunt, albeit with some contrived and obvious justification for her bitchy attitude, and relationship or not, nothing will change. And if he got a cure, the mother would instantly put him to use for "the sake of the family" before some bs change of heart. It's a pointless internal struggle.