I’m sorry to hear that. I’ll pray for their safety!
Before this, the deep South has been the only real area of concern and my friend and all of our family live in the North. Our house is in Chiang Mai and the Muslim community there is relatively small. I would guess that there are more Christians there than Muslims but the great majority are Buddhist.
Bangkok is a big concern because there are large Muslim communities both Thai and foreigners. It is a good time for us to be in USA for several months.