Do any of the WDW resorts have conjoining rooms? Our family consists of 2 adults and soon 5 children (unborn, 3, 6, 11 and 13 years old) and I´m wondering what our options are if we would like to stay on-site at some point?
All resorts have adjoining (or as you say, conjoining) rooms; this only means they are next to each other.
If you want an interior door between two rooms, meaning you will not have to completely exit one room and then re-enter the other through exterior doors, the phrase you want to use is CONNECTING rooms. Connecting rooms have interior doors that allow you to walk freely between the two rooms.
I'm pretty sure all WDW resorts have connecting rooms, but they are limited.