DH and I have spent many holidays over many years at the same hotel on a Greek island. As a result we are firm friends with the owner and his family, have seen his children grow from young men into fine adults. We started going there pre DS's arrival and bloody love the place. They adore our DS (4yrs old) also and were delighted at his arrival
This year, in December, the eldest son is getting married and we have been invited. DH is particularly close to him. We would love to go for him and also to experience a traditional Greek wedding. We feel very honoured to be invited.
Now, it would not be a problem for DS to come with us, also not a problem financially. BUT, is it unreasonable of us to go without him? We would stay 4 days maximum and have willing grandparents, who he is used to staying with, who have offered to have him for the weekend. I would just love to be able to experience it without the constant "Come here please....no don't touch that..." et etc. It also wouldn't be too much of a bind to get absolutely trollied just with DH 
I guess I feel a bit guilty as DS really loves the place and the family etc. But he's only 4 right? Would it hold a lifelong memory for him at this point?
So AIBU?