Their children will get it in the end!
After their parents death it seems life goes on for Karl, Klaus and Karolin ... but my consolation is knowing that if these people were real, they will get whats coming to them in the end!
Franzi will realize she is so much better than Karolin (who actually pawns off her own parents to her because she can't be bothered and makes her take them around) and leave her.
Klaus and his wife (Emma?) will grow up and realize their kids treat them the same way as they treated Rudi and Trudi (Remember the kids? All they cared about was their video games!)
Karl will probably die alone.