Robert Jeffrey was born 1605 in London, London, England to William Jeffrey (1542-1641) and Awdry Harvey (1550-1658) and died 11 November 1646 Newport, Newport County, Rhode Island of unspecified causes. He married Mary Gaunt (1608-1677) 15 April 1626 in London, London, England.
Children
| Name | Birth | Death | Joined with |
| Mary Jeffrey (1625-1691) | |||
| Thomas Jeffrey (1628-1674) | |||
| Elizabeth Jeffrey (1629-1684) | 16 February 1629 London, England | 18 September 1684 Warwick, Kent County, Rhode Island | John Sweet (1620-1677) |
| Robert Jeffrey (1636-) | |||
| Jethro Jeffrey (1638-1739) | |||
Siblings