Nelson Alex
 male                           (17xx-    )    census 1851: married, age over 50, Dalhousie
 female                         (17xx-    )    census 1851: married, age over 50
 male                      (1821~1831-    )    census 1851: married, age 20-30
 female                    (1821~1831-    )    census 1851: married, age 20-30
 - male                    (1831~1841-    )    census 1851: single, age 10-20
 - female                  (1841~1851-    )    census 1851: age under 10
 - male                    (1841~1851-    )    census 1851: age under 10