Susan Schneider, the third wife of the 63-year-old actor is reportedly planning a "very private" funeral in the Bay Area following his untimely passing on Monday. Family members, including his 31-year-old son Zak, have begun flying into town ahead of the service.
According to a source, the memorial will be intimate and for close friends and family - including his younger children Zelda, 25, and Cody, 22.
The source told E! News: "It's not official yet, but that's the plan. It will be small. They were both very private people."
In addition to the private service, the source claims a comedy benefit night will be held for the public in honour of the Hook actor.
The tribute will take place at the Throckmorton Theatre in Mill Valley, California, some time in the next few weeks, but nothing has yet been finalised. The venue cancelled their planned show on Tuesday out of respect.
Announcing their decision, the theatre said: "We are in deep mourning for our dear friend and incredible human being, Robin Williams. Tomorrow's Mark Pitta & Friends show has been cancelled. We ask for your understanding at this time."
Following Robin's death, Susan - who married the Aladdin star back in 2011 - released this statement, which is worth reading again in light of recent reports:
"This morning, I lost my husband and my best friend, while the world lost one of its most beloved artists and beautiful human beings. I am utterly heartbroken. On behalf of Robin's family, we are asking for privacy during our time of profound grief. As he is remembered, it is our hope the focus will not be on Robin's death, but on the countless moments of joy and laughter he gave to millions."
Some thoughts on the passing of Robin Williams by our Editor