Funny! We did that few times, nice having Mommy/Daddy time alone. We did take GMA/Papa with us on Kids first Cruise, definitely helped at time Impossible get a 5 passenger Cabin. We had 1 kid assigned to their Cabin but all 5 of us were in an OV, with 2 Pullmans set up as 2 Bunk Beds and 2yr old sleeping with Mommy. After my Wife passed I just took the 3 Kids ages 3, 5, 9 on Cruises with me, just the 4 of us no issues and did it many times after...