Here is a compilation I put together of rare interview excerpts, probably from c. 1979, featuring Jackie Coogan, Lita Grey Chaplin, and Sydney Chaplin. These clips were extracted from the documentary Great Romances Of the 20th Century: Charlie & Oona Chaplin (1998).*
Note: Eric James tells a different version of Sydney's bathroom story here (or maybe it happened twice!)
*Courtesy of my dear friend, Lucy.