MANHASSET, NY (WCBS 880/ 1010 WINS) — All her life, the only thing Danielle Petratos had of her father was a single photograph.

Danielle Petratos and John Watson at their reunion this past summer. (Handout)

Now, after nearly four decades, she has more than just a picture. Danielle and her dad, John Watson, are together again – thanks to Facebook.

LISTEN: 1010 WINS’ Mona Rivera talks with the woman who has reconnected with her dad

Watson, who is a Vietnam War veteran, was suffering from post-traumatic stress disorder (PTSD) when he abandoned his wife and then 3-year-old Danielle 39 years ago.

The now 42-year-old Petratos said that she forgives her father. The Manhasset mom is choosing to look ahead.

Watson credits Buddhism and the internet with helping him prepare for and, finally locate, his long-lost child.