Chestnut
Assuming that you have a very good reason for not having him there is nothing else to be done. You have explained that you can't do it and presumably why, so the outcome cannot be changed. The ball is in their court to find someone else, but this could cause a permanent rift if they take offence. You need a watertight and fully justifiable reason for not having him, and if possible should have him if you want to maintain good relations with your family.
This is a very good answer.
I would only back out for health problems. They will have been looking forward to the trip.
There could be a good reason not to take the two year old, we do not know.


