I live on the East Coast and by bus I plan on 45 minutes to Orchard MRT area. I can take the bus then train and time wise it's much the same. If you plan on a car, it will be a shorter time (about 25-30 minutes), but you'll have other costs. There are several families who send their children to Eton House or Chatworth East (both British) and live on the East Coast. I think it is much quieter out East, nice shops, East Coast Park nearby, Parkway Parade.
Do you have a particular area in mind? I live at Kew Green where most places are 4BR terraces in a
condo setting, 3 pools, no tennis, but a small gym. Lots of younger children, so very family friendly. Good luck and welcome to Singapore!