DS is 4 in March and he has never had a sleepover. For me, I get up to DS and comfort him straightaway and, I don't trust other people to do that. I hate the idea that they would let him cry for however long when I wouldn't do that if he woke up through the night (especially in a different environment to what he use to, I believe he would be disorientated and scared if it wasn't handled right)

I have had a few nights away but OH has always looked after DS and OH has been away overnight heaps but I was there.

I don't think it is an insult to his family that you don't want to let your LO stay with your IL's. This is your baby and it is upto you when you are ready to let her sleep anywhere else.