Hi Lindsey and welcome to Mom's Panel!
How lovely that you will be taking both your Mother and Sons to experience Walt Disney World together. I'm sure that you will create some memories together which will last a lifetime during your trip!
I have given your question some considerable thought and here are my suggestions:-
1/ 2 connecting rooms in a resort of your choice which would provide you with 2 double-size beds and bathroom in each of the 2 rooms.
2/ A 2 bedroom deluxe villa which would include a master bedroom complete with a king-size bed and whirlpool tub, second bedroom area with a queen-size bed and double-size sleeper sofa or 2 queen-size beds, and a living room which can have a queen-size or full-size sleeper sofa.
3/ A 3 bedroom deluxe villa which would include a master bedroom complete with a king-size bed and bathroom with whirlpool tub, second bedroom with 2 queen-size beds and bathroom, third bedroom with 2 full-size beds and bathroom and living room area with a queen-size sleeper sofa.
Your decision will no doubt be impacted by your budget so I have listed my 3 suggestions from the least expensive to the most expensive. The most economical way to allow each of you to have your own bed would be to have 2 connecting rooms at a Value Resort.
You can find out more about each of the Resorts
HERE
I hope that this has helped you to come to a decision and please come back and ask me another question if I can help you further.
One thing that is for sure is that regardless of where you stay, you will have a magical time!