BRIAN: You still haven’t talked to him, have you?
RORY: Don’t nag, Dad.
BRIAN: You can’t be with the Doctor forever.
RORY: Says who?
BRIAN: You both do. You’ve been cutting it back. Building a life. You said you’d had a meeting about applying to adopt…
RORY: We have, but what if we’re wrong? It’s a lot to give up. You’ve seen it, Dad. There’s so much out there.
BRIAN: And you’ll never see it all. You can’t. So don’t try. It’s better to leave the party while you’re still having fun…….I want to be a grandad, Rory. I’d be really good at it. Don’t make me wait forever.
-The Doctor Who Companion: Editing The Power Of Three