Here's more proof that Drake's the greatest thing that ever happened to his pops, Dennis Graham.

Apparently, the elder Graham put down some big bucks on the Raptors -- for which Drake is an official team ambassador -- to win the NBA title.

"I am the happiest guy in the world. I bet one hundred thousands on the game, and I won three hundred thousand," Dennis said, with a girl on each arm, when approached by TMZ.

He also had a strong opinion on whether the Raptors should visit the White House or just stick to their current plan of checking out Canadian Prime Minister Justin Trudeau's house.

 "Justin Trudeau is a much classier guy than that idiot. Donald Trump," he explained.