Win a beautiful children's book

This delightful picture book by Yoav J. Tenembaum dwells on the loving relationship between a grandfather and his grandson as they try to answer a universal query.

Just why DOES Grandpa walk so slowly?

In his quest to know why he is so slow, Grandpa asks his friends the turtle and the snail. Their answers surprise him and may surprise young readers, too!

To be in with a chance to win one of three copies just answer the question below:

How old is the grandson?

a) four

b) five

c) six

In need of a HINT