A letter passed down in my family cites as her father George W Allen, born Feb 22, 1861 in San Francisco, California. His father was William Allen, born March 27, 1819 in Glasgow, Scotland. His mother was Elizabeth Carney, born Oct 17, 1825 in Carlisle, Pennsylvania.
I have not persued the legal documents to verify this.
"Genealogy.com/famousfolks/gracieallen" follows the maternal ancestry in the Darraghs.
A more likely birth date for Grace is July 26, 1895.
Any confirmation or expansion on this will be of interest.