I took a family member in, Heroin addict, Difference is I'm single and have no kids and I would never do it again.
I found that every word out of his mouth was a lie, He would manipulate me into getting money, He would tell me he was buying food then would sneak off and buy his drugs then come back off his face. He promised over and over that he would change.
I then came home to find my tv was gone and also my laptop. He stole them to trade in for drugs. Of course he was sorry after the fact and was now getting clean.
He let me set up appointments here there and everywhere and would show up slurring his words and off his face, making me look like a complete idiot. got him on methadone and he started selling it for heroin, I then found out he was getting a friend to pee into a bottle for him so it looked like he was clean so I threw him out. the more i did for him the worse it got..
Two days later I had his dealers at my house demanding the money he owed them.
Three years later he is still on heroin, is on the verge of becoming homeless because he doesn't pay his bills and has been arrested and bailed, he showed up to court off his face.
He has sold everything he owned even down to his kettle, has no way to cook, owns thousands in unpaid bills, not paid his council tax for over a year and his flat now looks like a squat, needles all over the place/outside/at the back of his flat.
You can't fix him, you can't make this better, you can't do this to your family. i know how hard it is to say no and seemingly sit back and let it all happen. they only get help when the time is right for THEM. nothing you say or do will change him or the situation.