Tom Selleck has two children: his daughter Hannah, born December 16, 1988, with his wife Jillie Mack, and his adopted son Kevin from a previous marriage.
While some tabloid-style reports have referred to him as a “grandfather of six,” there is no credible confirmation from major media outlets or from Selleck himself supporting those claims.
In fact, a Washington Post profile describing the 79-year-old actor as having a “grandfatherly air” appears to use the term figuratively — referencing his demeanor and presence, not his actual family status.
Selleck’s memoir, which reflects on his career, personal life, and his close bond with his daughter and life on his ranch, does not clearly mention any grandchildren.
Conclusion:
Despite online rumors, there is no verified evidence that Tom Selleck has grandchildren. The “grandpa” label seems to be more symbolic than factual — at least based on reliable sources currently available.