Dude, why steal from your family? That screws trust out the window. When the trust is gone it's harder to get real help when you need it. My brother has a bad theft habit and my dad won't let him live at my dad's house because of it. He doesn't even get to spend the night when he visits. But, my sister, who has drug issues is allowed to stay, because she doesn't steal and my dad tries harder to help her.
In my experience, drugs fork life over. They bring hard times and unneeded worry. Trust me, after the first time your house gets raided and the cops take anything of value in your house, you'll think again about how much you like that pot. (or whatever it is) When this fighting is an everyday occurance, are the drugs worth it?
I've given up most of my family because the drugs have warped them so bad they just use and abuse the people they're around. I used to love them, we used to get along, and now I only have a little tiny bit of family I still consider family. Holidays tend to suck for me and I miss some family that I'd still talk to, but the other freaks go to these events and I don't need the issues. Don't let your family do this, it's sad, and there is something you can do now.