Libros en español sobre familias diferentes

Jen, a school librarian, is wondering if anyone has any suggestions of books in Spanish for little kids (pre-K through 1st grade level) about families of different shapes than the nuclear family. Books that are specifically about two-mom or two-dad families, one-parent families, kids being raised by grandparents, etc. Or books like "Everywhere Babies" that just show a variety of different families as part of the story.

Anyone have any ideas for her?