After a long night of cheering in Halifax, Brad Marchand's grandfather is jumping in the car for the long ride to Boston.

"It's an 11-hour drive, but it's worth it," said Eugene O'Leary.

O'Leary watched his grandson score two goals and assist on the Stanley Cup-winning goal in Boston's 4-0 victory over Vancouver on Wednesday.

It was pandemonium at his house.

"When that first goal went in we were high-fiving and hugging each other. By the time the second and third goal went in it was just crazy," said O'Leary.

It started off as a small family gathering. In early playoff games, the Bruins lost every time the extended Marchand family got together. Most relatives waited until after the win to descend on O'Leary's home.

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Eugene O'Leary is heading to Boston to see his grandson Brad Marchand with the Stanley Cup. ((CBC))

"They were afraid they would jinx the game," he said.

O'Leary was a Toronto Maple Leafs supporter before his grandson joined Boston last year. The new Bruins fan was still wearing his Boston jersey and cap Thursday morning.

O'Learly plans to get a few hours of sleep before heading to Boston with other family members for the Stanley Cup parade.

"It's a pretrial for the one here in Halifax, I think," he said.

Marchand will get to bring the Cup home for 24 hours. When Sidney Crosby brought it home to Nova Scotia  in 2009, an estimated crowd of 25,000 turned out.

O'Leary is focused on celebrating Marchand's victory. At some point, the proud grandfather will get back to his golf game.

"Oh, it's terrible," he said with a laugh. "I have people from other fairways hollering at me when I'm swinging the club and of course the ball ends up in the woods, not down the fairway."