Who's the smart one?

Four retired guys are out, first one tees up, slices his ball into the
trees, has to go retrieve it. While he's gone, one guy says "So Bob,
how's your son doing?" "Well, you know my son's got an auto dealership,
and they had their best year ever. It was so good that he gave a friend
of his a car." Next guy: "So Bill, how's your son doing?" "Well, you
know my son's got a boat dealership, and they had their best year ever.
It was so good that he gave a friend of his a boat." Third guy: "So
George, how's your son doing?. "Well, you know my son is a real estate
broker, and he had his best year ever. It was so good that he gave a
friend of his a house." Meanwhile, the guy who lost his ball is back:
"So Sam, how's your son doing?" "Well, I dunno. You all know my son's
gay... But he must be doing something right because some friends gave
him a house, a car, and a boat."