Robin Williams's friends and Family Remember His Legacy 

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Robin Williams\'s Friends and Family Remember His Legacy

For Zak Williams, the grief is always there, but the memories come in waves – sometimes small, sometimes tidal.

It has been more than four months since his father, comedian Robin Williams, took his own life at age 63.

Since that awful day on Aug. 11, "I miss him all the time," Zak, 31, tells PEOPLE.

"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," he says of himself and siblings Zelda, 25, and Cody, 23.

"The key thing is just to take things a step at a time. I know it sounds a little clichéd, but really focusing on what\'s in front of you, focusing on your well-being and then trying to fill our hearts so we can be there for others is really important."

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