A friend of mine is a single mom whose son has been asking why his dad left the family. Her son is around 4 years old, and becoming aware that everyone else seems to have a dad except for him. She isn't sure how to handle it.

I've found a lot of books about how to help kids process adoption, and other resources for kids who had a parent pass away. But I don't know of any resources for kids whose dad basically abandoned the family... I did a search on Amazon, but haven't heard of any of these books or authors:

http://www.amazon.com/s/ref=sr_nr_n_2?fst=as%3Aoff&rh=n%3A283155%2Cn%3A4%2Ck%3Asingle+mom+children%27s+book&keywords=single+mom+children%27s+book&ie=UTF8&qid=1452473494&rnid=1000

Does anyone know of any books or movies that can help kids process something like this?