Robert Arbuthnot, Jr was born on an unknown date to Robert Arbuthnot, Sr, 1st of Haddo-Rattray (c1694-1756) and Mary Petrie (-1756) and died 5 November 1803 of unspecified causes. He married Mary Urquhart (1745-1818) 1759 .
Children
| Name | Birth | Death | Joined with |
| Robert Arbuthnot, III (1760-1809) | |||
| John Arbuthnot (1762-1796) | |||
| Jane Arbuthnot (1763-1819) | |||
| Mary Arbuthnot (1764-1781) | |||
| Elizabeth Barbara Arbuthnot (1765-1841) | 2 June 1765 | 28 April 1841 | John Hunter (1751-1816) |
| William Arbuthnot, 1st Baronet (1766-1829) | 24 December 1766 | 18 September 1829 Edinburgh, Midlothian, Scotland, United Kingdom | Anne Alves (-1846) |
| Thomas Arbuthnot (1770-c1771) | |||
| George Arbuthnot (1772-1843) | 4 December 1772 Edinburgh, Midlothian, Scotland, United Kingdom | 3 November 1843 | Elizabeth Fraser (1792-1834) |
Footnotes (including sources)
| ‡ General |