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.

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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.

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