Isak MAYER 1747 - ? | his parents
& ca 1789 Breunle ----- 1755 - ? | her parents
of Neidenstein, Germany 

This is my working hypothesis - the way I see it as of this moment!! 

Isak Mayer was born 1747 in Neidenstein, Germany. He married Breunle [last name unknown] of Neidenstein.

Children of Isak Mayer and wife Breunle:
1. Mayer Mayer ca 1790 Neidenstein, Germany - ca 1855
       married 1st unknown ca 1800 - ca 1830
       married 2nd Babette Grunebaum 1805 - 1885
2. Rees Mayer 1795 Neidenstein, Germany -
       married Joseph Mayer 1790 -
3. Mordische (Marx) Mayer ca 1801 Neidenstein, Germany -
        married Jette [Yittle] Levy 1802 -
4. Jonas Mayer ca 1804 Neidenstein, Germany - Jan 1875
        married Karolina ?

Joseph MAYER 1790 - ? | his parents
& ca1815 Rees MAYER 1795 - | her parents
of Neidenstein, Germany 

Children of Joseph Mayer & Rees Mayer:
1. Hayum Joseph Mayer 1817 Frankfort - 18 Sept 1899 NJ
      married 1st wife ca 1842
      married ca 1848 Esther Mayer 1821 Reichelsheim Ger - 31 Aug 1899 Jersey City NJ
2. Brenda (Brendel) Mayer ca 1834 Frankfort - ca 1880 Ger.
      married Frankfort Ger. ca 1846 Max Oberndorf 1824 Rimbach Germany
         moved to Heppenhelm, never came to America
       a. Amalie Oberndorf 1847 - 1924 Germany
           married 1902 Isaac Oberndorf
       b. Marie Oberndorf 1849 Germany - 
       c. Matilde Oberndorf 1851 Germany -
       d. Herman Oberndorf 1854 Germany - 1925 Chicago IL
           married Chicago IL 31 May 1878 Helen Goodkind 14 July 1860 - 1928 Chicago IL
            i. Julie Oberndorf ca 1880 Chicago IL - ca 1880 Chicago IL dy
           ii. Leon Oberndorf 6 Nov 1882 Chicago - 1945 California
          iii. James Oberndorf 1 May 1887 Chicago - 1950
          iv. Robert Oberndorf 1 May 1887 Chicago - 1947
           v. Beatrice Oberndorf 12 Oct 1892 Chicago - 1985 Chicago IL
                married Edgar N Greenebaum 1890 - died Chicago IL  occ: Banker
                      1. Edgar Greenebaum Jr. 2 Nov 1914 Chicago IL -   occ: Banker
                      2. Robert J Greenebaum 30 July 1917 Chicago IL - occ: Banker
                          married 14 Feb 1945 Nancy Rosenheim 
          vi. Alice Oberndorf 8 Oct 1901 Chicago IL -
                married Norman Hoefeld
       e. Babette Oberndorf 1856 Germany -
            married Steinhardt
3. Sophie Mayer 1832 Frankfort, Ger. -