So we're doing Liberty (not until November 2020) for 7 nights. My kids will be 12, 9 (almost 10) and 3. We've shared a verandah on
DCL this past November but actually MIL was the adjoining room so the two older kids bunked with her instead. I can't imagine all 5 of us being in the same small room!
With that said, we booked an Ultra Spacious Promenade View room (we were able to book just 3 in that cabin even though it sleeps 6!) and right across the hall a standard balcony for our Liberty cruise next year. We will have about 520 square feet for all 5 of us which is like 3 times the space as Disney. I went through a TA and actually never even priced out the Ultra Spacious Promenade View room alone for all 6 of us as I wanted a balcony. We are paying $3,800 for BOTH rooms including some OBC.
Our
Disney cruise this past November was just 3 nights and we paid $3,200 for a third of the space
Be flexible with your dates if possible and have a TA do some work for you and price out different rooms. I realize this post is over a month old but if you have booked chime in with what you ended up doing!