"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... It's through helping others that I've begun to heal." Robin Williams' eldest son, Zak, is still struggling to come to terms with the actor's death. The father-of-three committed suicide in August (14).