hi!! i'm new to this page so i'm a bit nervous. anyway, i think there's a branch of Judo at The Dojo, run by my coach Tan Yi (i'm a judoka studying in RGS, so i train in the CCA) at Siglap South CC if it is convenient for you. They run children's classes every Wednesday, Friday, Saturday and Sunday at various times. Check it out here: http://www.thedojo.com.sg/schedule/
Wish your kids a great judo journey!!