_David ALEXANDER _________
                                             |                          
                       _James ALEXANDER _____|
                      | (1691 - 1756) m 1721 |
                      |                      |__________________________
                      |                                                 
 _William ALEXANDER __|
| (1726 - 1783) m 1747|
|                     |                       _John SPRATT _____________
|                     |                      |                          
|                     |_Mary SPRATT _________|
|                       (1693 - 1760) m 1721 |
|                                            |_Maria of PEYSTER ________+
|                                              (1659 - 1700)            
|
|--Mary ALEXANDER 
|  (1749 - 1820)
|                                             _Robert LIVINGSTON _______+
|                                            | (1654 - 1728)            
|                      _Philip LIVINGSTON ___|
|                     | (1686 - 1748) m 1708 |
|                     |                      |_Alida SCHUYLER __________+
|                     |                        (1655 - 1727)            
|_Sara LIVINGSTON ____|
  (1725 - 1805) m 1747|
                      |                       _Pieter VAN BRUGH ________+
                      |                      | (1666 - 1740) m 1688     
                      |_Catherine VAN BRUGH _|
                        (1689 - 1756) m 1708 |
                                             |_Sarah Hendrickse CUYLER _+
                                               (1666 - 1742) m 1688