Sometimes people do change. Sometimes someone that has unfairly attacked or hurt you feels genuine remorse and they reach out and own what they did. From there, it's possible to have a genuine relationship and possibly "love" them as a friend or a beloved family member.
I think so, given the right circumstances and a broadening of understanding between us.
I knew two young people (when I was a young people myself) who loathed each other but married and stayed married. What did they find that they shared? A hatred of ethnic minorities. Amazing that they didn't turn that venom back toward each other.