Daughter-in-law of Florence Hackett.
Ex-stepmother of Marshall Neilan Jr..
In 1984 Blanche Sweet helped friend, producer Thomas R. Bond II re-establish the 'Biograph Company [us]' aka 'American Mutoscope & Biograph Co. [us]' which is the oldest movie company in America, established in 1895.
Off screen pseudonym: Daphne Wayne
She was named "Blanche" after her maternal grandmother, Blanche Alexander, who raised her.
Sister-in-law of Albert Hackett.