Robert Giffen was born circa 1750 in Pennsylvania, United States of America to Andrew Giffen (c1720-1767) and Agnes Nesbit (c1720-) . He married Catherine McCrea (c1750-) .
Children
| Name | Birth | Death | Joined with |
| James Giffen (1771-1832) | July 1771 Middleton Township, Cumberland County, Pennsylvania, United States of America | 7 November 1832 Carlisle, Cumberland County, Pennsylvania, United States of America | Martha Elliott (1776-1824) |
Siblings
| Name | Birth | Death | Joined with |
| John Griffen (1743-1809) | |||
| Halinda Griffen (c1747-) | |||
| Robert Giffen (c1750-) | 1750 Pennsylvania, United States of America | Pennsylvania, United States of America | Catherine McCrea (c1750-) |
| Andrew Griffen (c1752-1812) | |||
| Martha Giffen (c1757-c1840) | |||
| William Giffen (c1760-1812) | |||