As salaam brother,
When I read Sahih Al Buharri, it was narrated that Muhammad (pbup) said that "you should not stay mad at your Muslim brother more then three days."
It really would be good for you and your family to forgive them, even if they hurt. The better one is the one that forgives one that has done them extremely wrong. Allah will be proud of you. You guys will be the better person for caring about them and things. They will probably realize what they did to you and feel bad. I heard once that Allah places us around family and people that are: alcoholic, addicted to drugs, abusive,... all these things. Allah does this because He wants us to be the ones to guide them and remind them of the consequences that will follow if they don't repent and step out of the darkness. He put us with them because we can help them, if he would have put them with somone else, they probably wouldn't have gotten help. So take it as a blessing and ask Allah for guidance and make dua. It's important that you reach out to relatives and keep a good connection. Deep inside they'll appreciate it. Talk to them and reach out to them, even if they still don't care for you. Keep doing it, Allah will reward you, and if they're not doing good Allah knows. So just show them kindness and you just might be the reason they change and perhaps they'll apologize for what they've done to you. Inshallah you guys can figure it out and become one again. ☺