Maritie (Mary) Yerxa
- Daughter of William Yerkse and Catrina Sie
- Born 10 July 1753 at Mt. Pleasant, Long Island NY
- Christened 14 April 1755
- Married Abraham Syffer 17 April 1773 at Sleepy Hollow NY
- Married Isaac Dean Jr. 9 May 1784
- Died 20 October 1836
- Abraham Syffer was born 1748
- Son of Johannis Syffer and Lea Buys
- Christened May 1748
- Died before 1784 at Philipsburgh NY
- Isaac Dean was born 1751
- Son of Isaac Dean Sr. and Amy Weekes
- Died 19 October 1831 at Tarrytown NY
Children of Maritie Yerxa and Abraham Syffer
- William Syffer born 17 January 1774
- Catriena Syffer born 9 July 1775
- Lea Syffer born 1777/1778
- Johannis Syffer born 6 April 1779
Children of Maritie Yerxa and Isaac Dean Jr.
- Samuel Dean born 28 August 1785 at Mt. Pleasant NY
- Abraham Dean born 15 July 1789 at Mt. Pleasant NY