You can request two connecting rooms at any resort and you would have four beds and two bathrooms. That is what my family of six has done many times. If the kids are under 18 it will be guaranteed. If not, it is only a request and may not be honored although our experience has always been that they try very hard. There is also the cabins in FW. They have one bedroom w/double bed and bunks, a murphy bed in the living room, full kitchen, and maid service, but only one bathroom. Depending on the resort that you choose, two connecting rooms can be cheaper than deluxe rooms, suites, and villas.
Good luck and have fun planning!