Wanted to update you on this:

Heard from Karen, and she spoke to her mother a couple of days ago. First of all, her mother wouldn't be comfortable to let the Cat Care people look for the cats in all their old things, she would be embarassed about that. She also told Karen that she hasn't seen the cats for several days, but she was told by a neighbor that they were seen in another neighbor's garden. And this neighbor is known to be more cat-experienced, and to care a lot about cats. So the mommy cat obviously brought her kittens to a place where they are looked after.

Don't know if I'll ever get more news on them, but I hope they'll be doing fine in their new "home".

Kirsten