>>No. We were only seeing him for ~ 10-15 minutes in the car. In the yeshiva each kid has different person to teach them, so they didn't see him there a lot also.
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>I doubt they would talk to you, but you could try to discuss the matter with his yeshiva instructors? Explain why you're concerned, etc, and see if they've seen any type of disruptive behavior.

My older son said he did observe some problems, actually.

Anyway, I called her couple of minutes ago and she is OK, much better when last time she called me. She went to climbing activity with her son, so now everything seems to be Ok.