My gut reaction, given that the 11 year old seems to be on her own with her thoughts a lot, is to hang in there for the summer to get them through this initial difficult period. You say she has things booked to do so that will help her move on. You need to remember that the schools have just broken up for the holidays and a lot of children - and the 16 year old is still a child - have time on their hands. I'd also be inclined to stay around at least for the first couple of weeks of the new term. It's a new start for both children with new teachers and new subjects. My experience, as a teacher who saw similar situations with young people, is that the the familiarity, discipline and atmosphere of school does give them a support system they don't have during the holidays. Perhaps the young lad, if his home life is as unsupportive as your OP suggests, is just looking for some support in his grief. Normally, in school term time, he would be picked up by the member of staff in charge of welfare and monitored and counselled. The 16 year old is young and will move on as he goes into his senior years at school and new opportunities will present themselves - as will new friendships of the romantic kind. Presumably your GD is starting a new school and being kept busy, is healing in itself. As for your DD, I'd let her sort things out for herself. She will do that faster if you keep your counsel and concentrate on your GD. Best wishes for a calm summer and my condolences to all affected at this sad time.
