If it were me, I'd go for the 3BR grand villa. . .then again, I like lots of space.

I suppose it depends upon your preferences. The 2BRs have lots of space, but you'll have to make choice between these options:
Option A: You let your mom and dad take the MBR with the whirlpool tub. You and hubby get the fold out couch in the living area and the kids get the second BR.
Option B: You switch with your mom and dad.
Option C: The kids get the fold out couch in the middle of the suite while you/DH and your folks flip a coin for the two bedrooms.
As far as pure room, there is plenty given you have an actual dining area, separate TVs in each sleeping area, and a second bathroom. However, someone will have to sleep in the living area or share one of the beds in the second bedroom while the kids sleep in the other. For sheer comfort, there is always. . .
Option D: You get a bedroom, your folks get a bedroom, and the kids get a bedroom. . .the grand villa option! For what it's worth (I've never stayed there), DVCers say that OKW has bigger rooms. Good luck with your decision.
