We booked connecting Cat 10s. (Inside/split bath). We put DH and 2 DDs on one and myself and 2 DDs on the other, BUT DH and I slept in one and 4DDs in the other. We kept the doors open between most of the time. We sometimes turned the dead bolt of each door which kept them almost closed but either side could push them open. (a spring keeps them closed unless you use a door stop or elastic "cable-tie" to hold them open.) You can also get extra door "keys" so you can enter either.
DDs were 6, 8, 12, & 14 first cruise and 8,10,14,& 16 on the second.