If your kids want to get into kite surfing, or windsurfing, you might think about taking them on a week long vacation to Aruba. Why Aruba? Well, they have consistent winds and warm water. In one week, they will most likely be able to pick up all the skills they would have learned in about a year or two kite surfing around their home. Of course that doesn't apply if you live in Hawaii or someplace like that.
If you do decide to take a vacation out there, think about taking the lessons with the kids. Or at least try the lessons for a day or two just to get an idea of what the sport it like. The kids will most likely enjoy sharing this adventure with you.
Aruba Kite Surfing School will be able to get you and the kids on the water with the gear and lessons that you need.