Tom Brady posts birthday tribute to son Jack, and people can't believe how tall Jack is

Tom Brady is celebrating his oldest son Jack's 17th birthday in a sweet Instagram tribute.

The former NFL quarterback posted several pics of the father-son duo enjoying activities together, including a game of golf. One photo in Brady's collection shows him standing side by side with Jack, who's now as tall as his 6-foot-4 dad.

Another image shows Jack sitting alongside his younger siblings, Benjamin, 14, and Vivian, 11.

"Happy 17th birthday to the kindest, sweetest, most thoughtful 17-year-old, I know.