[QUOTE=kop84;27740630 Are you, your spouse, and children all planning on flying in the same cabin?

Officially if you and your spouse are in F/J and your children are in Y the UM fee would need to be paid. YMMV if DL collects that.

If everyone's in the same cabin then there are no worries.[/QUOTE]

Not true any longer. Delta changed the requirement back in 7/16. Parents and children under 15 do not have to be seated in the same cabin to avoid UNMR fees and seating restrictions.