Just try pulling those kids away from MK on their first day. If you go dine at resort, then you would have only just begun MK before you have to leave to get to an ADR.
I say MK or change plans and found out who has evening EMH and hit that park the first day and eat there…but I wouldn’t suggest pulling the kids from a park to a resort, just to dine after on being there 4-6 hrs.
If MK, I would do Crystal Palace and get some character dining in 1st.
BTW, Congrats & I am sooo jealous.