I have known a Robert Oversteegen from Eindhoven and his wife - he was a neighbour. He was an artist (painter/sculptor) - died some years ago. His wife died earlier.
I did meet one of his sons (I do think his name was
Bertrand, I'm not sure)
If this sounds familiar, you can contact me (jan (at) ismijndomein.nl), I have more info.
By the way, your message was published on the "Brabant-Walloon" message board - that is the French-speaking part of Belgium. But Eindhoven is in the Netherlands, and Dutch-speaking.