+--Walter OLKO  (19 MAY 1924-19 JAN 1992)
David Martin OLKO  (12 NOV 1949-2 MAR 2016)
|  +--Leo MULLAEVY 
+--Margaret Mary MULLAEVY  (16 MAR 1928-9 FEB 1994)
   |     +--Wilhelm VOLLMAR  (6 APR 1851-14 NOV 1931)
   |  +--Carl Henry VOLLMAR  (15 JUN 1878-2 JAN 1947)
   |  |  +--Helen Mar EWING  (ABT 1855-)
   +--Helen Julia VOLLMAR  (15 JAN 1905-APR 2000)
      +--Mary RASKA