Cabbie21 The thread has tangented off a little but lots of things are the same as when your own children were younger.
I notice you say this doesn't affect you personally so what is it that is really worrying you?
My instinct is to say support your own child/children in playing host to their older children and not the grandchildren.
I get a sense something concerns you about this.
If you want direct experience then try mumsnet?
Relationship Investigations in the Digital Age: Contact Wizard Web Recovery
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Never mind they did eventually grow out of the puerile stage, we still see a couple of them from time to time, they're responsible adults now, I did ask one of them who has a boy on the cusp of teen years, if he will enjoy being woken up to the smell of bacon being cooked "well no, son is a vegetarian and anyway I wouldn't put up with it" Yeah right wise words, just wait a lot of changes between 11 and 18. 