Are you an owner booking with your own points or having points transferred in, or are you renting, or paying cash through Disney? That might affect your ability to book 2-3 villas in the same resort for the same time. The time of year you want to book will also affect availability.
If you're considering AKV, the Kidani villas are larger than the Jambo villas, and the Kidani 1 BR have 2 full bathrooms and the 2BR have 3 full bathrooms. The BLT (monorail resort) 1 and 2 BR also have the extra bathrooms.
I'd also look carefully at the floor plans and plot out the sleeping arrangements - who will sleep on the sofa bed (and chair bed at Kidani or BLT)? A 1BR will have 1 king bed in the main bedroom and a queen size sofa bed in the living room; a 2BR will be a 1BR with an attached studio, which will have a queen bed, a queen sofa bed and sometimes a bunk size Murphy bed (depending on resort) along with a kitchenette and its own door to the resort hallway. In a dedicated 2BR, the studio will have 2 queen beds, no kitchenette and no separate door.
Many here who have experience with multigeneration/multifamily trips also recommend that each family have their own space, even if just a studio, rather than trying to put everyone together. Sometimes having a 1BR or 2BR plus several studios allows for a central gathering space as well as kitchen and laundry but also allows each family to have a little privacy.
Edited to add - I'm stymied by the "things to do" other than parks. All the resorts will have nice swimming pools. Kidani has a community center room with activities, but I think that's mostly geared towards kids.
For MK resorts, I'd look at BLT for proximity to MK as well as lower cost. For Epcot area, BCV - or maybe Riviera if budget allows, due to easier access to dining in the building as opposed to outside and down the walkway. I do love AKV but prefer Kidani for the reasons I outlined above. Guests staying at Kidani have access to both Jambo and Kidani pools, and a free shuttle runs continuously between them, making it easy to access pools and dining.