The best thing you can do is to cut him off completely!
To say it bluntly, (so you don't further get hurt, but I believe you know already)..he doesn't care about you, and apparently never will. He has shown this not only in his request that you do such a thing, but by his absenteeism in your life.
You are very fortunate for the authorities there in your country.. He cares only for himself, that's obvious, and should be ashamed of himself!
Your sisters are lucky to have you!
Explain to them what he has done, and what he is about, in no sugar coated words. They need to hear.
So sorry you had to live through this.