My grandparents lived in a brownstone on Rue des Bassins in Anderlecht near the Capitol. There was a park across the Chaussée de Mons where I remember playing.
The most fun that we had though was when the whole family got together on the weekends and we drove to The Castle of Beersel a marvelous middle age castle in a lovely park or to the Castle of Gaasbeek another marvel, but with an enormous park to run and play in!
I ran my poor cousin to exhaustion! He wasn't used to running like I was as he spent most of his time in school or at home studying. I didn't know there were all sorts of things you weren't supposed to do so I had fun chasing the ducks and climbing on the castle walls.
Otherwise I remember being pretty well behaved. I remember my very first french lesson with my grandmother (who spoke no English- no one did! My father spoke perfect French when he was courting my mother so they all figured I'd learn by osmosis, I guess!) The lesson involved breakfast and it took me about 15 minutes to figure out my grandmother was asking me if I wanted a boiled egg!
Once I figured that out, food became by chief learning tool and my grandmother's kitchen became my classroom for more than just learning a new language!