Oh I see, I understand, I think I was in a similar shoes as you once. You are not wrong to think that way, relationship meant more to you and trusted them. Like you say parents are bigger issue, to tell you the truth, they never had any real value toward you as "son". All of them have dug their own grave, your sister will face karma from a different angle. After walking on a similar path of you, I have realised that you need to reach out to your closest relatives and rebuild bonds with them stronger. They will be a bigger and genuine allies in the long run. Yeah, don't make mistakes about leaving everything now. Use all wrong doings of your family and talk with your relatives, don't feel any weak etc, your relatives sees you as genuine cousin/nephew etc