Patti, we booked for a June 6, 2004, cruise (through a Carnival PVP) 2 adjoining cabins (with the private door between us). We did this in January, 2004. I may be wrong; but I think this is the only deck that has the "adjoining" rooms on the Conquest? There will be 4 of us family members. We weren't worried wether or not we could get cabins private door between us as our children are young adults.
However, if I had young children, I would try reserving the connecting staterooms fairly early if you can afford it and are not wanting to be on top of each other for 7 days. Some people though prefer to room 4 together in a stateroom as they aren't in their stateroom very much during the cruise. It's all depends on your preferences. You should also be able to get nearby rooms for grandmas, grandpas, aunts and uncles also.