2-week 2-centre holiday in Spain for 2 couples, one with DS aged 14, one with 2 DSs aged 14 & 10.
One adult (parent of 2 DSs) did all the organising. Accommodation costs split in half.
For meals out, when it was suggested that bills were split down the middle, couple with 1 DS went along with it, but grudgingly and clearly feeling hard done by. (10-yr-old did not eat a lot)
Who WBU?