Looking for an old fic

I was thinking about rereading some of the older fics on FF Net. There's one in particular that I am looking for and I cannot remember it's title. In the fic, Georg had adopted Gretl. Gretl was sick with something and couldn't go to school, so Georg hired Maria as either a nanny or tutor. Somehow, they find out that Gretl is Maria's daughter that she gave up for adoption. I was telling a friend about it and she wants to read it too.

Any idea who wrote it or what it's title is?