The job is the same - to attempt to make it sound like you've never said it before and as if it's just occurred to you. And that's the same whether you're on camera or whether you're on stage in a room full of people.
I'm not an actor who consciously accesses bits of my life, in order to play parts. Obviously, you don't need to have been a father to play one, otherwise everyone who's been a father would be able to act.
