I bought this book for my 3.5 year old son and it immediately became one of his favourites. The story is touching and realistic (it's a true story) and the expressions on the penguins' faces are marvellous. My son brings it out to be read all the time and I have had to buy many more copies for my friends who have fallen in love with the book as well!
Roy and Silo are two penguins who actually live in the Central Park Zoo and their keeper notices that, although they are both male, they are displaying mating behaviours with each other. They make a nest, and put a rock in it (their "egg") which they incubate. The keeper gives Roy and Silo a real egg to foster and they become proud parents to little Tango, the first penguin at the zoo to have two Daddies.
If you are looking for a book to introduce your children to the idea of same-sex relationships and parenting, you will love this book.