Team Singh scored an eagle and four birdies on the back nine at the Ritz-Carlton Golf Club to finish the 36-hole scramble event at a 26-under 118.
That was enough for a two-stroke win over two other father-son duos: Justin Thomas and his father Mike Thomas, and John Daly and his son John Daly II.
Team Singh birdied each of their first seven holes before slowing down and making four straight pars.
"We made some good putts but he hit two of the best two-irons I've ever seen him hit" on the front nine, Vijay Singh said of son Qass, 32.
The younger Singh was delighted with the victory.
"It's what we wanted," he said. "We wanted this all year, so just to have it finally is like it's almost a dream come true.
"It's going to be a memory I'm going to have forever."
Team Thomas led after Saturday's first round thanks to a 15-under 57. They shot a nine-under 63 on Sunday, while Team Daly posted a 59 to tie the Thomases at 24 under.
The elder Daly, 56, revealed earlier this week that he's scheduled for a left knee replacement on Wednesday after having his right knee done three years ago.
Ireland's Padraig Harrington and his son Paddy Harrington shot a 60 Sunday to finish fourth at 22 under. Nelly Korda and father Petr Korda (61), Matt Kuchar and son Cameron Kuchar (62) and Germany's Bernhard Langer and son Jason Langer (63) tied for fifth at 21 under.
Tiger Woods and son Charlie Woods put together a seven-under 65 following Saturday's 59.
Team Woods tied for eighth at 20 under with Jordan Spieth and father Shawn Spieth (63) and Mark O'Meara and son Shaun O'Meara (63).
The elder Woods played through plantar fasciitis in his right foot in order to participate in the father/son event. His son had sprained an ankle recently.
"Charlie and I, we played great yesterday," Tiger Woods said. "Today we were both like walking penguins out there. It was all good, though."
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