The sitcom ended in 1982, so Ronson couldn’t have been more than 6 or 7.
His parents were well connected in Hollywood.
Ronson said he asked Williams about the memory when he saw him at a restaurant 20 years later.

(L-R) Mark Ronson and Robin Williams.Dave Hogan/Getty Images; Robin Marchant/Getty Images
“And he goes: ‘Wait, your parents lived in the house on Circus Road?
Man, they threw some incredible parties.'”
Such eccentric happenings weren’t uncommon in his household.
The DJ and producer’s new Apple TV+ music documentary series,Watch the Sound,premieres July 30.