Actually, I tried 2 weeks ago the Gong "Family", designed to be ridden by parents + 2 kids, and it is quite fun.
15' x 35" x 8" 640l
www.gong-galaxy.com/magazine/news/gear-new-couine-family/
It is less bigger than the starboard, so it can be paddled solo confortably
Electric pump is welcome on these sizes :-)
I was sketpical at first, but I may buy one to keep in the basement, and use some times per year with wifey / kids, or lend to my daughters when they come with their boyfriends for some cruising around...