Alexander married Jane HARRY about 1710 in , New Castle, DE, USA. Jane (daughter of Hugh HARRY and Elizabeth BRINTON) was born about 1687 in Chichester, Chester, PA, USA; died before 25 Apr 1743 in London Grove, Chester, PA, USA. [Group Sheet] [Family Chart]

1. Mary UNDERWOOD, * was born about 1710 in , Chester, PA, USA; and died.
2. Samuel UNDERWOOD was born about 1713 in London Grove M.M., Chester, PA, USA; died about 1773 in , Orange, NC.
3. Elizabeth UNDERWOOD was born on 18 Aug 1714 in , Chester, PA, USA; died before 1767.
4. William UNDERWOOD was born on 18 May 1720 in , York, PA, USA; died on 18 May 1785 in , York, PA, USA; was buried after 18 May 1785 in Warrington Twp., York, PA.
5. Joseph UNDERWOOD was born about 1722 in Christian Hundred, New Castle, DE, USA; died after Apr 1757 in , New Castle, DE, USA.
6. Ann UNDERWOOD was born in 1723 in Warrington, Bucks, PA, USA; and died.
7. Jane UNDERWOOD was born about 1724 in Christian Hundred, New Castle, DE, USA; and died.
8. Olive UNDERWOOD was born about 1726 in Christian Hundred, New Castle, DE, USA; died before 1767.
9. Benjamin UNDERWOOD was born about 1728 in London Grove, Chester, PA, USA; died on 8 Dec 1803 in Warrington Twp., York, PA; was buried in Warrington Burial Ground, Warrington Twp., York, PA, USA.
10. Elihu UNDERWOOD was born about 1730 in Warrington Twp., York, PA; died about 1801 in Warrington Twp., York, PA.
11. John UNDERWOOD was born about 1732 in Warrington, Bucks, PA, USA; died on 18 Jun 1776 in Warrington Twp., York, PA.
12. Ruth UNDERWOOD was born about 1734 in Warrington Twp., York, PA; and died.
13. Thomas UNDERWOOD was born in in , Chester, PA, USA; died in in London Grove, Chester, PA, USA.

Alexander married Sarah Boatwater BEALS on 16 Feb 1748 in Monocacy M.M., Prince George's, MD. Sarah died about 1761. [Group Sheet] [Family Chart]

Samuel married Mary Ann WILCOX about 1685. Mary (daughter of Henry WILCOCKS and Sarah LEWIS) was born about 1670 in , New Castle, DE, USA; died after 1722. [Group Sheet] [Family Chart]

Thomas married Elizabeth UNKNOWN before 1645. Elizabeth died before 1674. [Group Sheet] [Family Chart]

Henry married Sarah LEWIS. [Group Sheet] [Family Chart]