Research into young children's fiction about two-dad and two-mum families

[Sunderland, Jane]

Can anyone help? A student of mine is writing a dissertation on the
above topic, and we are surprised at the lack of academic literature on
this topic (there's more on fiction for teens, but that's not what he's
interested in).  Does anyone know any? (Is anyone perhaps working on
this topic?)

He'd also like to know of any examples of these books. He already has:

One Dad, Two Dads, Brown Dads, Blue Dads
Asha's Mums
Josh and Jaz have Three Mums

If you can help, please contact Mark McGlashan (m.mcglashan at lancs.ac.uk)
directly.

Many thanks

Jane Sunderland