How do i deal with my selfish family?

my family and i are not a close family. i had been staying with my boyfriend at his place because we both worked at the same place and it's a better environment. lots of drinking is done by my mother and her husband. him and i are not on speaking terms. my 30 yr old sister, her 24 yr old boyfriend, and my 10 yr old niece also live there. my sister has a major attitude problem that my niece has adopted and i found it insufferable tobe around them. he's no winner either. its a small place and she had been living in the basement with him, while my niece and i had upstairs rooms. recently, my sister and her boyfriend decided it was ok to move all my stuff out and move into my room. my mother apparantly had no say. i never felt so hurt in my life. i'll have to go home for a week or two while my bf goes home for thanksgiving break. which means i will stay on the couch. i just can't seem to forgive my sister and i really don't want to spend any time with any of my family anymore. any advice on what to do and how to handle this situation? thanks alot guys :)