FK,
Interesting point you bring up about training and attuning at the same time. From Posy's post I got that the mother and her son were wanting just treatments, "working on". Which is it Posy?
For training I can see multiple people in the same room even with two teachers but if I recall Posy is the only teacher level.
For attunements I say one student done privately at a time.
When I was learning we had a class room/treatment room for all and another room separate for the attunement done one student at a time. I do this also.
Donna