I really hope your parents are OK man. It a looks fucked up!
Are you sure it's DISIT and not DUSIT?
http://www.dusit-laguna.com/ is in Phuket.
I found pretty much no references to DISIT, but ofcourse that might all just be the same.
It does look like it's right next to the water as well though.
I hope they were visiting some inland stuff man :|
Good luck!