Robert Herjavecto the rescue!

TheShark Tankstar, 58, lent a helping hand to a family stranded on Lake Joseph in Ontario, Canada on Tuesday. The group in question? Former pro hockey playerTom Lawsonand his three children with wife Breann: daughters Ava, 15, and Faith, 14, and son Luke, 11.

“I was out jet skiing and I saw a boat drifting with a dad and his three kids, waving their arms frantically,” Herjavec, who shared a video of the rescue effort onInstagram, tells PEOPLE exclusively. “My first thought was they must loveShark Tank, but then I realized they were out of gas and stranded.”

There was “a sense of urgency” to get them to safety since the sun was setting, Herjavec explains.

“They were in an unlit aluminum boat not meant to be out at night,” the Herjavec Group founder says. “We found a rope, tied it to the jet ski and I towed them back to their lake house.”

Breann Lawson

Robert Herjavec and Tom Lawson

“Did my good deed for the day!” he adds. “It’s funny, the dad is a fireman and said to me he normally rescues people — so now I get to say I rescued a fireman. They were super nice, appreciative and bigShark Tankfans. See, sharks can be nice too!”

Robert Herjavec and Tom Lawson

Lawson tells PEOPLE the incident occurred on Tuesday at around 8 p.m, after he and his kids went for a ride on a fishing boat.

“On the way back, approximately 1 km away from our cottage for the week, we had some boat trouble,” theHockey Clubowner says. “We didn’t have much luck waving down the first few boats that went past. We saw a Sea-Doo and we were lucky enough to catch the driver’s attention. As the fella on the Sea-Doo got closer, we recognized that it was Robert Herjavec! The experience became even more humbling.”

Lawson says Herjavec “did not hesitate” to help tow them back to their dock.

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Lawson’s mother-in-law, Yvonne Murphy,tweeted a photofrom the rescue effort and thanked Herjavec “for rescuing my daughter’s family,” adding ina separate tweetthat the family was “forever grateful.”

Speaking to PEOPLE, Murphy says Herjavec and Johnson, 45, “were very kind and gracious to my son-in-law and grandchildren.”

Herjavec is best known for appearing as an investor on ABC’sShark Tank. He has been a part of the reality series since its debut in 2009.

The Canadian businessman previously appeared on the Canadian version ofShark Tank, titledDragons' Den.

Herjavec has beenmarried to Johnsonsince 2016. He shares 3-year-old twins,Haven Mae and Hudson Robert, with Johnson, as well as Caprice, Skye and Brendan withex-wife Diane Plese.

source: people.com