I think some people will debate whether or not it was appropriate or not that you guys talked about your t's life today. But you did say that he was clear that the session was about you and not him, so, to me at least, it seems like that was an appropriate conversation. When my t's grandmother died we talked about it a little bit since she mentioned her a lot prior to her death and I knew they were very close. So I've been in a similar situation with my t, and she handled it the same way your t seems to be.

I don't think you should worry about being gentle with your t, but I'm not saying that from a heartless place at all. I understand why you asked that question. It sounds like he is taking time off, and to me that means he will (or should be) be taking time to process/deal with grief and other feelings. Like your t said, therapy is about you. They are trained to work with clients admist their personal life--tragedies and all. A healthy t knows their limits and how something like a death could possibly impact their wellbeing, and should take time off as needed. You could give him a card, but I also believe spoken condolences are just as meaningful as well.

Hope I could help a little!