Paul McCartney releases his first book for children: “Hey, Grandude!”

Sir Paul McCartney wrote a book for children about the adventures of his grandfather and his four grandchildren, BBC reported. 

The title is of course a nod to the Beatles' Hey Jude: “Hey, Grandude!”

The story tells about the adventures of grandfather and his four grandchildren.

The nickname Grandude was given to him by his own grandchildren - the daughters of the musician Stella and Mary had four children.

"One of my grandkids - who used to call me 'Grandad' - just happened one day to say 'Grandude' and it kind of stuck," McCartney explains. "So the other kids started calling me 'Grandude'."

Photo: Babyccino Kids