I own both the Getaway and the AI, and love them both, but for different reasons.
I can't tell you which one will be best in your case, but here is why I like each of them.
I love the AI for the quiet mornings before the wind comes up. It glides on the water almost effortlessly and I can deploy the sail when the wind eventually comes. It's rock solid, and lets me explore shallow coves. The mirage drive allows for hours of pedaling. And being a single person boat, I don't feel oblige to take anyone along when I just want my own time.
The Getaway takes a little more effort to get going. While I can get the AI from the trailer to the water in less than 15 min, the Getaway takes me 20-25 min to launch by myself from the time I get to the parking lot. Also, if the wind dies you don't have the Mirage drive to take you home, but a small electric motor pushes it easily. I have a Minnkota 30 with a small 30Ah AGM battery, and I get about 30-45 min of get-back-home time when the wind dies depending on whether there's any chop. The Getaway moves nicely, though it's not an H16. It's easy to sail solo, but can also carry the whole family. It's the ultimate social boat!
I'm bias so I'd recommend you get both
All kidding aside, You can't go wrong with either. If your kids are very young, they'll probably won't get on the AI often (try keeping a 3 yr old quiet on a yak for more than 5 minutes). On the other hand, they'll love the Getaway's tramp.
If you must trailer the boat to your sailing grounds, the Getaway will take more prep time. It can be rigged solo, but is easier for two people. And if you want to go camping, you can load enough gear (within reason) for the kids.
Get either, get both, have fun!