The WILLIAMSON family of Tumblin, possibly from Nesting

       Theodor WILLIAMSON ===== Christina TAIT
       b1796?               |   b1789?
       (Nesting)            |   (Nesting)
                            |
    ---------------------------------------
    ?        |       ?                    |
 Andrew    John    James WILLIAMSON  Christopher
 b1816-21  b1821   b1824?            b1829?
           (Aith)  (?)
                   m1849 ===== Catherine LEISK
                           |   b1817-18?
                           |   (Tumblin?)
                           |
    ---------------------------------------------------
    |         |           |                           |
 George     James      Jessie                     Catherine
 b1850      b1852      b1855?                     b1862?
 (Tumblin)  (Tumblin)  (Tumblin?)                 (Tumblin?)
                       m1879? ===== James MANSON
                                |
                          --------------
                          |            |
                    James William  Catherine