I guess it just show he is so deep into his MLC or whatever it is, that he just can't seem to budge out of it enough to deal with real life. Poor S has such hope, even now, after all that has happened. I mean, things could turn around, worse cases have been fixed. But, it seems so hurtful for him to not make it any easier for S to bear at all. And for S to say his experimentation with drugs was to get his F's attention is saddest of all. Will you be talking to his C about it?
It would be great to get closer to your mother. My mother and I got closer a few years before she had a stroke, and I am so glad we did, because we hadn't been close since I was really little. She got to where she would call me to find out about the rest of my sisters, and we bonded over (of all things) reality tv. Now that she is in the condition she is, I am really glad we had those few years.
I hope things with your s will get better soon, he is running on his 15 year old emotions now.