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The comedian's wife Marsha Garces Williams began divorce proceedings in March, citing irreconcilable differences.
The couple have been married since 1989 and have daughter Zelda, 18, and 16-year-old son Cody.
But Zelda said the break-up was not acrimonious and praised her parents for staying married for as long as they did.
She told People: "It wasn't a complete surprise. It's never easy to end. [But] there's no bitterness - we're all a family."
She added: "I just want my parents to be happy. And they did last 18 years - a lot longer than most!"
Williams also has 25-year-old son Zachary from his first marriage to Valerie Velardi.
