Robin Williams' son misses his late father ''all the time''.

Zak, 31 - whose father committed suicide in August this year at just 63-years-old - has revealed that he and his two siblings, Zelda, 25, and Cody, 23, think about Robin every day.

Zak said: ''I miss him all the time.

''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'.

''There's not a day that goes by that we don't think about our dad.''

Zak also revealed that he has started volunteering at a local prison, so he can follow in his father's footsteps of always giving back.

He told People magazine: ''It's through helping others that I've begun to heal.''

Meanwhile, it was recently revealed that the 'Mrs. Doubtfire' actor's children will inherit $50 million after he reportedly left the bulk of his estate to his sons and daughter.

According to a copy of the will, his third wife, Susan Schneider, will be looked after under the terms of a prenuptial agreement they signed before they tied the knot in October 2011.

Robin's fortune will then be distributed by the Robin Williams Trust, which is being run by a trustee, an official document dated January 31st 2011 revealed.