Woods, 49, and Vanessa Trump, 47, who both live in Florida, have been together since Thanksgiving and are quickly becoming golf's new power couple.
Four sources confirmed to DailyMail.com that the pair are an item.
They live 20 minutes apart in the wealthy southern Florida enclave of Palm Beach and were spotted together at a golf tournament last month.
Vanessa's eldest daughter Kai, 17, and Woods' children Charlie, 16, and Sam, 17, all attend the $38,595-a-year The Benjamin School.
Other members of the Trump family, including all five of Vanessa and Don Jr.'s children, are aware they are an item, one source said.
A source said: 'Tiger and Vanessa have been seeing each other since just before Thanksgiving.
'She comes to his place on Jupiter Island. They’re not living together. She comes over maybe a few nights a week.
'They just love hanging out, having dinner and schmoozing together. They’re sticking close to home, have decided not to make it a thing and go out in public. Not just yet anyway.'
Vanessa filed for an uncontested divorce from Don Jr. on March 15, 2018 in New York.
Since they officially split she has not had a high-profile relationship.
Don Jr. has remained a close adviser to his father and helped take over much of the business.
Kai Trump and Charlie Woods are both aspiring golfers with sights set on turning professional.