I'm going to give you two answers. One answer is if you want to know what you should think about for your own research to find a place you'll like, and the second is if you just want to be spoonfed and not think. Don't take offense, but our visitors are split roughly 50/50 into those catagories.
How many kids? How big of a condo
? Every single area of Singapore is about the same amount of "family friendly", with the exception of Geylang (redlight area). Everything else is fine. So use gothere.sg or the MRT website's tools to see how long your commute is from various stations. Then search for condos
with XXXX meters of those stations. Many realestate/rental sites have tools to do exactly that. If you're really worried about being near a park, look for MRT stations near various parks, beaches, or the big green blob in the middle of the island.
Look for a condo near Bishan.