"Sir." Both boys returned it, Ron a little warily. Over this past year, he had been over to Hermione's house a few times for dinner, so he could get to know her parents better. Well, really, Ron had been over to Hermione's parents" back patio for dinner - judging by the ginger's reports back to Harry, David Granger could be quite intimidating. He was an older father, sometimes came off as gruff, and was clearly very protective of his little girl. To the point where the man seemed reluctant to actually let Ron into his house.