Individual Details
Living
( - )
Families
| Spouse | Living |
| Child | Thomas Postlethwaite ( - ) |
| Child | William Postlethwaite ( - ) |
| Child | Living |
| Child | Living |
| Father | Living |
| Mother | Living |
| Sibling | John Lewthwaite ( - 1781) |
| Sibling | William Lewthwaite (1745 - ) |
| Sibling | George Lewthwaite ( - ) |
| Sibling | Living |
| Sibling | Living |
| Sibling | Living |