Watch the full interview with Dev Patel on ABC News' "Popcorn with Peter Travers" above. ... who was separated from his brother in India at the age of 7 while scavenging for food on a train.

Dev Patel, the British actor, knew how it felt to question your identity. Growing up in London, he tried to play down his Indian roots for fear of being bullied.

"The greatest influence in my life has been my own mother, so when I read this, I knew I was gonna do this film for her," says the actor. By Mia Galuppo Lion, which is already receiving awards ...

Dev Patel (l.) with Sunny ... One day he stumbled on the aerial view of the tiny station where he got separated from his older brother — right down to the water tower that looked so much bigger ...