If anyone knows anything about his past...
Drug and alcohol issues.
Failed marriages.
Health issues.
From Wikipedia:
Marriages and children
Robin Williams' first marriage was to Valerie Velardi on June 4, 1978. They have one child, Zachary Pym (Zak) (born April 11, 1983). During Williams' first marriage, he was involved in an extramarital relationship with Michelle Tish Carter, a cocktail waitress whom he met in 1984. She sued him in 1986, claiming that he did not tell her he was infected with the herpes simplex virus before he embarked on a sexual relationship with her in the mid-1980s, during which, she said, he transmitted the virus to her. The case was settled out of court. Williams and Velardi divorced in 1988.[42][43]
On April 30, 1989, he married Marsha Garces, his son's nanny, who was already several months pregnant with his child. They have two children, Zelda Rae (born July 31, 1989) and Cody Alan (born November 25, 1991). However, in March 2008, Garces filed for divorce from Williams, citing irreconcilable differences.[43][44]
Williams married his third wife, graphic designer Susan Schneider, on October 23, 2011, in St. Helena, California.[45] Their residence was Williams' house in Sea Cliff, a neighborhood in San Francisco, California.[43][46][47]
Wouldn't be surprised if Williams had the MLC bug.
L