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Yes. Leslie Parnas is Madalyn and Cicely Parnas's grandfather.
Moses Parnas has written:
'Sefer ha-Parnas' -- subject(s): Jewish law
David Parnas was born on 1941-02-10.
Jakub Karol Parnas died on 1949-01-29.
Jakub Karol Parnas was born on 1884-01-16.