Do you know if the children were naturalized citizen?
Lempi might be a Finish first name.
Did you find the family on 1930 census? That is the census that would have Na-naturalized; Al-alien or Pa-first paper.
Did George come to America as Gyorgy? Would be beneficial to your research to locate records on him like arrival manifest, draft registration form or naturalization intent. Those documents would have his place of birth.

Take a look in this site www.iabsi.com/gen/public
Would you know any of these descendants that listed surname SAKSA in www.helenezx.homestead.com Slovak Pride Index
surname, location, descendant
Saksa ? Murphy
Saksa Pec. Nova Ves SARIS Bylo
Saksa Torysa SARIS Da Re