My mom just recently passed away. Im only 20 and my sis is only 19. We have no other family. So I am trying to fix everything. The problem is me and my sis were never really close to begin with. She won't do what I tell her and expects me to do everything. To make things worse her boyfriend lives with us. I hate him. We acualy got into a physical fight today. I take much more of this how do I get them to listen to me.

Talk to her. Tell her how you feel about everything. Let her see how what she does affects you.

Ive tried that it doesn't work

Then just walk away. Let he realize that she and her boyfriend aren't worth your time. You should be the better person and not let her or hi get you down. Life's to short to spend it arguing with family.