D.X.
I grew up there (Norridge) and it used to be almost 100% Italian (most of the Italians didn't speak much English either). And like you said, it is now mostly Polish. Even tho I don't live in Norridge anymore, I now live in Chicago, right near Merrimac Park (Irving Park & Narragansett). And guess what? Polish everywhere!!! Still, I have found many English speaking moms and kids at both the Norridge Park and Merrimac Park. Also, my son, who is about to turn 4, plays w/other kids that only speak Polish (my son and I don't speak any language other than English). It doesn't seem to bother him too much. I think it bothers me much more.
I work full-time, so I'm at the park in the evenings and on the weekends. If you want to give me a call, we can meet at a nearby park sometime...my son LOVES the Norridge Park!!! My e-mail addy:
____@____.com