you have a challenging set of requirements.
I kn9ow one boat that meets them all, look hard and find one of these:
Boston Whaler Harpoon Sailboats
The Harpoon is a very stable but excellent performing boat, I sailed one while my my family was young, we comfortably carried four adults and a bunch of kids and everyone had elbow room. The boat has so much form stability, I am not sure what it would take to turn one over, but I sailed it in all kinds of weather up to 30 knots and never felt uncomfortable...and in open water.
Read the writeup...find one and you wont be disappointed.