It's a family with three kids, two girls one boy (the two girls are adopted). The older sister was adopted as a baby or young child and Gretta joined the family when she was ten. Gretta and her sister are SUPER close, she was there for the birth of Gretta's youngest and has been watching the baby over the summer while Gretta works (that could be switched up though). Gretta just trust her more than anyone else in the world really. Because of adoption and all of that just about any pb would work, someone in early to mid 30s.