I have a lot more detail about some of this family at Strettell Jackson

FAMILY TREE:

 1  Thomas Jackson – NOTE: So far, I have no idea where he fits in.

........ 2  Josua Jackson b: 16 May 1722 d: 22 Jul 1774

............ +Anna Strettell b: 25 Jan 1725/26 d: 25 Mar 1800 in Church Lane, Yoghall, Co. Cork m: 20 Mar 1745/46

.................. 3  Robert Jackson b: 27 Jun 1748 d: Jan 1799

.................. 3  Mary Jackson b: 17 Dec 1749

.................. 3  Abigail Jackson b: 13 May 1751 d: May 1801

.................. 3  Strettell Jackson b: 16 Feb 1755 d: abt 1807 in of Peterborough, near Cork, Ireland

...................... +Mary Couzens b: 1758 m: 19 Aug 1780 in Co. Limerick

............................. 4  Joseph Devonshire Jackson b: 1783 d: Aft. 1842

................................. +Unnamed Clark[1]  m: 1811

............................. 4  Margaret Jackson 

................................. +Precious Clark 

............................. 4  Anna Strettell Jackson b: 1793 in Cork d: 20 Mar 1844 in Rapla, Co. Tipperary

................................. +John Tuthill b: 03 Jun 1793 in Lisnamrock Castle d: 13 Feb 1876 in Birr, Kings Co., Ireland m: 12 May 1815 in St. Peters, Dublin

.................. 3  John Jackson b: 27 Jun 1761

.................. 3  Josua Jackson b: 27 Jun 1761 in of Yoghal, Co. Cork d: 04 Oct 1801

...................... +Susanna Allen b: in of Yoghall, Co. Cork m: 22 Jan 1788

............................. 4  Josua Jackson b: 12 Jan 1789 d: 07 Oct 1836

............................. 4  Joseph Jackson b: 22 Apr 1790

............................. 4  Abigail Jackson b: 17 Sep 1791 d: 19 Jun 1838

............................. 4  Richard Jackson b: 24 Jul 1793

............................. 4  Anna Jackson b: 08 Feb 1795

................................. +Joseph F. Johnson 

............................. 4  Thomas Jackson b: 18 Sep 1796

............................. 4  Susanna Jackson b: 28 Jun 1798 d: 10 Oct 1807

............................. 4  Rebecca Jackson b: 14 May 1800