I think everyone in Singapore is great for families. I think if you want to make instant friends and have community, then i would look for larger condo
developments that have all the amenities etc...
We live in Tanglin/Upper Orchard area and love it. We are by Tanglin Mall so there are tons of moms and strollers everywhere.
you'll find that everyone will tell you that where they live is the best.
I would suggest you doing a scouting tour of the different areas before heading out with your estate agent. That way, you can see what's in the area: things within walking distance or if you need a car. Your estate agent can then focus in on properties in those specific areas.