DC2 is very excited about a school ski trip in 2020. For a bit of backgrounds, DC1 never showed any interest in going when it was their turn.
So she mentioned it again tonight over Dinner. DH has said we’ll have to discus it as Skiing isn’t an educational trip 
DH’s family are —slightly odd— maybe a little educational focused, DSIL refused the DNS going on non-educational trips and only does educational activities and only buys educational toys.
So how do I convince him it is educational for her to go to a foreign country and ski?
We’re not in debt but while we don’t earn a huge amount, we could afford to send her.
How would you convince him. Both DH and DC2 are out for a couple of hours so I’ve got time to put an argument together 