If drugs are involved then it's just as well he abandoned his family. His family is enabling his behaviour which will only make things worse for him. That is so sad. They're probably in denial, and the only person to blame would be you, in their eyes. The children, of course, see things for what they are --- they know their dad has blown his mind. There's nothing you could've said or done to turn them against him ---- he did it all himself.
Take care.
Me:57 H:52 M:28 Got another lawyer last year and filed. D35,S/D twins28,D22 EA4/04 End? Who knows? "Life is like a mirror. Smile at it and it smiles back at you." — Peace Pilgrim