How we cite our quotes: All quotations are from Harry Potter and the Sorcerer's Stone.
Quote #1
MCGONAGALL: Do you think it wise to trust Hagrid with something as important as this?
DUMBLEDORE: Ah, Professor, I would trust Hagrid with my life.
Hagrid is Dumbledore's family, in deed if not in blood. That helps define what this film thinks of family, and how it means far more than just your blood relatives.
Quote #2
MCGONAGALL: Albus, do you really think it's safe, leaving him with these people? I've been watching them all day. They're the worst sort of Muggles imaginable. They really are...
DUMBLEDORE: The only family he has.
Here, Dumbledore is strongly emphasizing the ties of blood. Even though Harry's a black sheep (and worse) to the Dursleys, they're not about to turn him away, which is what Dumbledore needs.