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 / Updated  / Source: TODAY
By Elizabeth Murray

Just days after what would have been his father Robin Williams' 64th birthday, Zak Williams opened up about how the family is still grieving after the death of the beloved actor.

"We try to focus on the joyful moments and memories," he told People Magazine, saying that with his siblings Zelda, 25, and Cody, 23, he is trying to celebrate his father's life in what ways they can.

Comedian/actor Robin Williams and Cody Williams attend "Cool Comedy - Hot Cuisine" presented by the New York Comedy Festival at Carolines on Broadway on October 06, 2007 in New York City.Getty Images

"We're still grieving," he said. "We're moving through the process of healing and recovering."

Zak told the magazine that the Williams family has been trying to honor their father's life by giving back. For Zak, one of those ways is through volunteering each week to teach practical financial skills to inmates at the San Quentin State Prison.

Last year, Zak also opened up to People about how the terrible loss.

"I miss him all the time,'' Zak said. "Often I see something or if I'm watching a film, I think, 'Oh, man, he would have appreciated this,' or, 'He would have gotten a laugh out of this.'"

On her father's birthday Tuesday, July 21, Williams' daughter Zelda posted a cloudy scene to her Instagram account and announced that she was taking a break from social media for a few weeks.

"People should remember what they want to remember of him," his daughter Zelda told TODAY in February. "That's their memories; that's what's important. I have mine and they are mine and I love that."