D7 is so agitated that she's started sleepwalking; S10 doesn't "know what the point of living is" in the wake of what his mother has done.
I know you know this, SP; perhaps you're doing it already. But if not, counseling is called for here. Don't send them. Bring them. The three of you together for family counseling. I did this shortly after D#1 (sigh) with my two boys, 13 and 15 at the time. It was invaluable.
Gardener
"My soul, be satisfied with flowers, With fruit, with weeds even; but gather them In the one garden you may call your own." Cyrano deBergerac