It’s been four months since Robin Williams’ tragic suicide and the late actor’s son Zak Williams says it’s still difficult coping with his unexpected passing. The 31-year-old tells People magazine, “I miss him all the time.” Speaking for himself and Robin’s other two children, 25-year-old Zelda and 23-year-old Cody, Zak adds, “There’s not a day that goes by that we don’t think about our dad. The key thing is just to take things a step at a time.