Parents who adopted a child and then regretted it, what's your story?

My parents fostered two boys. My one 'brother' has stolen about $2,000, just from me personally this year. But then again, he always stole since he was little. Food, games, anything. When he got older he started stealing cigarettes, vapes, juuls, and weed from people. He has also always been violent, with a short temper and anger management issues. I was older than him, and so I could hold my own growing up, but my two younger brothers were the ones really effected by it. One developed a victim complex- anything anyone did, from bumping into him, or accidentally drinking from his cup instead of theirs, was considered a personal attack on him, and he would get incredibly defensive and emotional. I don't blame him- he spent years getting harrassed and bullied in his home, and mostly his assailant got no consequences because he would just claim it was an accident, that my younger brother was overreacting, etc. My other brother just became equally prone to react violently, as a defense mechanism. Worst of all though is probably that he lies- about everything. Even things that don't matter. He will say he went to the movies when he went to taco bell. Say he didn't eat something, but the wrappers are under his bed. You can't believe anything he says. He's still violent. He still steals. Nature vs nurture ig.

Anyway, that's my bio brother. The two foster boys were both cool, and I hear they're doing well.

/r/AskReddit Thread