Here is a listing I found in 1930 in Cuyahoga Co,. Ohio. Could this be them?
Name Age
Anthony Marks 56
Anna Marks 52
Joseph Marks 15
Josephine Schuskowitz 11
*Mary Vaca 10
*Virginia Vaca 8
Genevieve Marks 17

I couldn't find a Mary Vaca on the 1920 census. If she were born in 1919, she should have been listed.