You may need to change your approach, don't push it at all.. I'm a bit pushy with my kid on soccer and she is not liking it.. watching kiting from the beach is good for 5 minutes then it gets boring.. and unless youre somewhere tropical it gets cold (this is a big problem).. when I take my kid, I promise to take her on the board and she is stoked about it. It's my wife that more the issue because she won't come and she won't have the kids sitting around on the beach.
Yeah, binderdundat....already blew it with trying to get the girls surfing when younger, pushed them in too early ... was all good until they got that ice water head dunking, then all of a sudden that super day wasn't so super any more.
So no pushing at all for kiting....and no one in my family comes to the beach ever! I can understand it, wind is uncomfortable, cold and noisy. Not much fun to go to the beach on a windy day ... until you're a kiter and then there's nothing better.
My old surf buddies are similar ... none have yet switched over, surfers HATE wind.