well it probley is much of a shock for kairi's mom and dad becuse she came home after kingdom hearts 1 so she got to see them less she just stood on that island waiting for sora and riku!
and for sora and riku I sure than explained every thing and ther parents were proud!
Actually Qwe, Kairi wasn't born on Destiny Islands. She was sent there by Ansem the Wise when she was around 5 years olds on the night of a meteor shower. She then stayed with the Mayor and his wife and grew up there. Just thought you should know that. Kairi's parents mostly were from Radiant Garden, but I believe from all the heartless attacks, they either are in another world, or lost their hearts to the Heartless. That's what I think anyways.