O''Bryan and O'Brien from MD to KY to IN

I am trying to find Parents of Peter O'Bryan and part of Ireland they were from.

Information I received from family members:

Descendants of Patrick Brien

     1         Patrick Brien           1790 - WFT Est. 1841-1882  (not possible for him to be Peter's Father)

....    +Mary Dempsey              1800 - WFT Est. 1842-1895

........        2              Peter O'Bryan          1776 - WFT Est. 1827-1868

..............                  +Jane Gardner          WFT Est. 1772-1792 - WFT Est. 1793-1876

........                        *2nd Wife of Peter O'Bryan:  

..............                  +Elizabeth Moore    WFT Est. 1774-1806 - WFT Est. 1828-1892

...................             3              Susan O'Brien           1826 - WFT Est. 1843-1920

.........................                       +Thomas Summers   WFT Est. 1794-1826 - WFT Est. 1844-1912

.............................   4              Mary A. Summers    1841 - WFT Est. 1855-1935

...................................                             +George H. Carrico  WFT Est. 1824-1844 - WFT Est. 1858-1930

...................                             *2nd Husband of Susan O'Brien:              

.........................                       +Andrew White        WFT Est. 1809-1829 - WFT Est. 1843-1915

.............................   4              Deborah Ellen White               1857 - 1922

...................................                             +William Richard Greenwell     1851 - 1914

........................................        5              Mary Agnes Greenwell             1876 - 1952

........................................        5              Susan Martha Greenwell           1877 - Unknown

........................................        5              Kathryn Lillian Greenwell        1879 - 1958

........................................        5              James William Greenwell          1881 -

........................................        5              Alice Madrena Greenwell          1883 - 1912

..............................................                  +James Richard Queen              1875 - 1963

..................................................              6              Unknown Queen      1902 - 1902

..................................................              6              Earl Francis Queen   1905 -

........................................................                        +Louise Ann Edwards              

..................................................              6              Walter Ivan Queen   1909 -

..................................................              6              Unknown Queen      1910 - 1910

..................................................              6              Ralph Daniel Queen 1912 -

..................................................              6              Infant Queen            1902 -

..................................................              6              Chester Vincent "Pat" Queen   1903 -

........................................................                        +Laverne Velma Burris            

..................................................                              *2nd Wife of Chester Vincent "Pat" Queen:           

........................................................                        +Sabina Koehler      

..................................................              6              Infant Queen            1910 -

..................................................              6              Genevieve Agnus Queen  (MOM)         1907 - 1999