Cladded in a white Tuxedo, the 26-year-old star was looking every bit a charming gentleman.
Patel's mother complimented him well in a black sari with minimal make-up.
Directed by Garth Davis, the true-life inspired movie is based on Saroo Brierley, an Australian-Indian, who tries to find his lost family in India through the help of Google map.
"It's mind-blowing. It's amazing I'm with my mother and this is very very beautiful and special moment. I'm still trying to absorb it," Patel said on red carpet.
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Sunny attended the Hollywood's biggest gala night in a black tuxedo and completed his look with green and yellow sneakers.
The eight-year-old kid was accompanied by his father and was seen mingling around with a lot of A-list celebrities and even clicked pictures with best actor nominee Andrew Garfield.
Priyanka Bose, who essayed the role of Saroo's mother, also stunned in an embellished, multi-color Vivienne Westwood gown.