Jimmy's Place
7411 Madison St, Forest Park
(708) 771-7476
The place starts off somewhat noisy so adding kids to the din is not an issue. Many times when we have visited there are tables with small children. Good pizza for the kids and nice Italian for the adults.
I'll also recommend The Depot All American Diner.
Erik's Deli
107 N Oak Park Ave, Oak Park
(708) 848-8805
I have often had meals with the kids here.
Buzz Cafe
905 S Lombard Ave, Oak Park
(708) 524-2899
While mostly a coffee shop they have some good menu items there and on weekends there will be families.
"Very good... but not my favorite." ~ Johnny Depp as Roux the Gypsy in Chocolat