your post struck home on some raw nerves especially when you refered to the new friends , i had this problem with my son as i think i told you before my brother in laws are only a few years older than my son but most of his life i have said hes not allowed to play or watch wwe as he would not now the diferance in playing and real and would take it out on his sisters,
i so feel your struggle to help your son and i hope you find a way to make it more comfortable for all concerened when he goes to this support family,
this didnt work for us and we ended up having someone just come and take son out for a few hours, but i look forward to when eldest daughter stays over at her dads or the hostel,
wishing you lots of luck you are a wonderfull mum