Michael Morpurgo 
My Father Is a Polar Bear [PDF ebook] 

"Look at the polar bears, " said Terry. "You see that one on the left, the fatter one? That’s our dad – our real dad. But you’re not to tell."Drawing on Michael Morpurgo’s own childhood experience of first seeing his real father on television, My Father Is a Polar Bear tells the story of two young brothers rediscovering their birth father in the most unlikely of places – and in an entirely unexpected guise! A warm and delightful tale of family bonds and love told by a master storyteller and beautifully illustrated by a talented new artist.