 Father | MaleAlexander UNDERWOOD |
| Born | Abt 1688 | , Anne Arundel, MD  |
| Died | 31 Oct 1767 | Warrington Twp., York, PA |
| Buried | 2 Nov 1767 | Warrington M.M., Warrington Twp., York, PA, USA |
| Married | Abt 1710 | , New Castle, DE, USA |
| Other Spouse | Sarah Boatwater BEALS | F4983 | |
| Married | 16 Feb 1748 | Monocacy M.M., Prince George's, MD |
| Father | Samuel UNDERWOOD | F4985 Group Sheet | |
| Mother | Mary Ann WILCOX | F4985 Group Sheet | |
 Mother | FemaleJane HARRY |
| Born | Abt 1687 | Chichester, Chester, PA, USA |
| Died | Bef 25 Apr 1743 | London Grove, Chester, PA, USA |
| Buried | ||
| Father | Hugh HARRY | F6509 Group Sheet | |
| Mother | Elizabeth BRINTON | F6509 Group Sheet | |
 Child 1 | FemaleMary UNDERWOOD, * |
| Born | Abt 1710 | , Chester, PA, USA |
| Died | Yes, date unknown | |
| Buried | ||
| Spouse | Thomas COOK, * | F6777 | |
| Married | 28 Sep 1731 | London Grove, Chester, PA, USA |
| Spouse | Joseph WELLS | F6690 | |
| Married | 27 May 1758 | New Garden M.M., Surry, NC, USA |
| Child 2 | Male Samuel UNDERWOOD |
| Born | Abt 1713 | London Grove M.M., Chester, PA, USA |
| Died | Abt 1773 | , Orange, NC |
| Buried | ||
| Spouse | Ann TRAVILLA | F4989 | |
| Married | 10 Mar 1738 | London Grove M.M., Chester, PA, USA |
| Child 3 | Female Elizabeth UNDERWOOD |
| Born | 18 Aug 1714 | , Chester, PA, USA |
| Died | Bef 1767 | |
| Buried | ||
| Spouse | William AILLES | F6681 | |
| Married | ||
| Child 4 | Male William UNDERWOOD |
| Born | 18 May 1720 | , York, PA, USA |
| Died | 18 May 1785 | , York, PA, USA |
| Buried | Aft 18 May 1785 | Warrington Twp., York, PA |
| Spouse | Ruth L. BAILS | F5205 | |
| Married | 2 Jan 1743 | London Grove M.M., Chester, PA, USA |
| Child 5 | Male Joseph UNDERWOOD |
| Born | Abt 1722 | Christian Hundred, New Castle, DE, USA |
| Died | Aft Apr 1757 | , New Castle, DE, USA |
| Buried | ||
| Spouse | Hannah WOODWARD | F5021 | |
| Married | ||
| Spouse | Elizabeth VANCE | F5014 | |
| Married | ||
| Child 6 | Female Ann UNDERWOOD |
| Born | 1723 | Warrington, Bucks, PA, USA |
| Died | Yes, date unknown | |
| Buried | ||
| Spouse | Stephen AILLES | F6678 | |
| Married | ||
| Spouse | Moses FRAIZOR | F6670 | |
| Married | ||
| Child 7 | Female Jane UNDERWOOD |
| Born | Abt 1724 | Christian Hundred, New Castle, DE, USA |
| Died | Yes, date unknown | |
| Buried | ||
| Spouse | William SMITH | F6673 | |
| Married | ||
| Child 8 | Female Olive UNDERWOOD |
| Born | Abt 1726 | Christian Hundred, New Castle, DE, USA |
| Died | Bef 1767 | |
| Buried | ||
| Spouse | Isaac COX | F6674 | |
| Married | ||
| Child 9 | Male Benjamin UNDERWOOD |
| Born | Abt 1728 | London Grove, Chester, PA, USA |
| Died | 8 Dec 1803 | Warrington Twp., York, PA |
| Buried | Warrington Burial Ground, Warrington Twp., York, PA, USA |
|
| Spouse | Susanah GRIEST | F5016 | |
| Married | Jan 1750 | Warrington M.M., Warrington Twp., York, PA, USA |
| Child 10 | Male Elihu UNDERWOOD |
| Born | Abt 1730 | Warrington Twp., York, PA |
| Died | Abt 1801 | Warrington Twp., York, PA |
| Buried | ||
| Spouse | Margaret MARSH | F6518 | |
| Married | 30 Dec 1756 | Warrington M.M., Warrington Twp., York, PA, USA |
| Child 11 | Male John UNDERWOOD |
| Born | Abt 1732 | Warrington, Bucks, PA, USA |
| Died | 18 Jun 1776 | Warrington Twp., York, PA |
| Buried | ||
| Spouse | Mary MORTHLAND | F5017 | |
| Married | ||
| Child 12 | Female Ruth UNDERWOOD |
| Born | Abt 1734 | Warrington Twp., York, PA |
| Died | Yes, date unknown | |
| Buried | ||
| Spouse | William MORTHLAND | F6667 | |
| Married | ||
| Child 13 | Male Thomas UNDERWOOD |
| Born | , Chester, PA, USA |
|
| Died | London Grove, Chester, PA, USA |
|
| Buried | ||
| Spouse | Elizabeth CLOUD | F5019 | |
| Married | 5 Aug 1738 | Kennett Twp., Chester, PA, USA |
| Spouse | Sarah KEELER | F5020 | |
| Married | ||
