I live just outside Philly in Ardmore (Haverford Township) which is nice neighborhood for families! We also have great schools. Mt.Airy is also an area that's very kid/family friendly.
Here's some fun ideas-
The Please Touch Museum https://tickets.pleasetouchmuseum.org/
Smith Playground http://smithkidsplayplace.org/
Academy of Natural Science http://www.ansp.org/
Kid friendly places to eat-
I don't eat in Center City often because with two kids (ages 6 and 10 months) can be a challenge! We do like going to Blackbird Pizzeria though since there's a park right across the street!
Singapore Chinese and Harmony are both kind to children.
You can go to the Franklin Fountain and get a vegan ice cream cone with the kids! http://www.franklinfountain.com/
Hope these tips help! Good luck.