Wow, itm, could he have been more dense? Not to rush right over when he finds out his S is doing something like that. That sort of thing should come before anything he finds more important. I hate to say it, but if this is the way he acts whenever there is a true emergency, and can't seem to be there to parent his S, then maybe a change of place might be in order. Maybe it will open STBXH's eyes; let him see how unimportant he himself has made their father/son relationship. What about S28, though? How would it affect him being able to be there for S15?
And good for you, telling S like it is if he comes in like that again. Don't need him getting into substance abuse. We have friends whose S is taking oxycontin, the mother has her own prescription drug problem, and the father has his head in the sand. Good for you wanting to nip it in the bud.
Do you often get to visit your mother in Foley? Was she from here, or moved here from elsewhere? I ask, because my mother was born and raised in Ohio, but once she and my father moved back here, she took to southern living like she was born here. And she could cook as good as any southern church lady. You would be close enough to get fresh Gulf seafood whenever you wanted. Or fish for it yourself off the State Park pier. And I would be jealous.