Pedigree

            /Johannes Gravenbergh
        /Ezeriah A. Grovenburg
       |    \Christina Van Yveren
    /Elias Grovenburg
   |   |    /William Thrall
   |    \Margaret M. Thrall
   |        \ Ladaisce
Bert Grovenburg
   |        /Joseph Schoonover
   |    /Joseph Henry Schoonover
   |   |    \ Unknown
    \Ida M. Schoonover
       |    /Sylvanus Cosselman
        \Henrietta Marie Cosselman
            \Mary Cosselman

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