Martha married David Phillips REES, * on 25 Nov 1785 in Grosmont, Monmouth, England. David (son of Thomas REES, * and Anne LEWIS, *) was born about Apr 1759 in St Mary, Abergavenny, Monmouthshire, Wales; was christened on 27 Apr 1759 in Abergavenny, Llanarth, Monmouthshire, Wales; and died. [Group Sheet] [Family Chart]

1. William REES was born about Jul 1791 in Abergavenny, Llanarth, Monmouthshire, Wales; was christened on 16 Jul 1791 in St. Mary, Abergavenny, Monmouthshire, Wales; died after 1851 in of Abergavenny, Monmouthshire, Wales.
2. Charles REES, * was born about Aug 1793 in Of Abergavenny, Llanarth, Monmouthshire, Wales; was christened on 6 Sep 1793 in St. Mary, Abergavenny, Monmouthshire, Wales; died after 1870 in Raccoon Twp., Gallia, OH, USA; was buried in Gilboa Cemetery, Gallia, OH, USA.
3. John REES was born about Oct 1795 in Abergavenny, Llanarth, Monmouthshire, Wales; was christened on 23 Oct 1795 in St. Mary, Abergavenny, Monmouthshire, Wales; died on 7 May 1863 in Gallia County, Ohio, USA; was buried in Raccoon, Gallia, Ohio, USA.

Notes:

There are two William Morgans in Grosmont that could account for this William. According to Freereg.org.uk, they are:

View 1
Wm. MORGAN Baptism 30 Jun 1715 Monmouthshire Grosmont : St Nicholas : Parish Register (Son of John, Joiner/Carpenter)

View 2
Wm. MORGAN Baptism 01 Sep 1715 Monmouthshire Grosmont : St Nicholas : Parish Register (Son of Thomas, Yeoman/Farmer)

There are still 2 Williams having children before and after Martha. One has a wife named Mary Jenkins and one has a wife named Jane. We don't which would be the mother of Martha or which would be her siblings. Martha's baptismal record does not list her mother to help us discern that.