Place of Birth: Piedmont, California, U.S.
Date of Birth: August 2, 1962
Ethnicity: English, Scottish, German
Cynthia Stevenson is an American actress. She was raised partly in British Columbia, Canada. She is married to Tom Davies, with whom she has one child.
Cynthia’s maternal grandfather was Frank Justin Boniface (the son of Walter Clifford Boniface and Justine R. Wagner). Frank was born in Montana. Walter was born in Missouri, to a German father and a Canadian mother. Justine was born in Illinois, to an ethnic German father from France and a German mother.
Cynthia’s maternal grandmother was named Eleanor Tanner/Tonner.
Source: Cynthia’s maternal grandfather, Frank Justin Boniface, on the 1920 U.S. Census – https://familysearch.org
I think this is her father:
His parents were LDS, of Scottish, English and Danish descent.