DS1 (8yo) is going on holiday with his Dad this year, abroad, for 1 week.
We have 2 other DC (4 and 2yo). We have the option to go away whilst DS1 is at his Dad's (not at the same time as him being abroad). I feel awful that we won't be taking DS1, but I will also feel awful if the other DC's don't get a holiday. It will just be camping in France, but we've done it the last 2 years running with all of them.
I don't know what to do 
What's fair in this situation?
- DS gets his holiday, we go away without him
- DS gets his holiday with Dad and comes with us (would need to be at a different time so with be a strain financially) (also will mean he's a holiday 'up' on the other 2)
- DS goes on holiday and we have a 'holiday' at home (DH take the time off, we do holiday things, we live in a holiday destination anyway so wouldn't be hard)
This is the first time DS1 is going away with his Dad so not had to deal with this before...