Robin Williams was a longtime champion of San Diego's Challenged Athletes Foundation, and Sunday, his children took over for their late father to present grants at the foundation's annual triathlon.
It was the first time Zelda and Zak Williams attended since their father died in August 2014.
"It's so good to see them around each other and hang out and, I think, not feel alone," Zelda Williams said of the racers.
Robin Williams was a dedicated philanthropist and served as an ambassador for the Challenged Athletes Foundation, which supports people with phyiscal challenges, like amputees, lead physically active lives and compete in athletics.
One of the athletes whose lives was impacted by the beloved comedian is grant recipient Patrick Ivison.
"That he took the time out of his insane schedule to come help people like me —there are no words," Ivison told NBC 7 San Diego.
On Sunday, Ivison received his very own rugby wheelchair from the Williams family so he can play professionally. It was one of three grants Williams' kids presented to challenged athletes.
"It was an absolute special moment," Zak Williams said.
Ivison said he couldn't be more grateful to Williams' kids.
"I'm so in love with the fact that they love us so much. Just forever grateful," Ivison said.