William is identified as a widower when he married Mary Summerton.
Witnesses to the marriage were William Summerton and Thomas Goodson

William and his first wife Elizabeth Smith had 10 children between 1771 and 1786. The first five were born in Sandford St. Martin, Oxfordshire, the latter five in Westcote Barton, Oxfordshire .

The marriage record at Sandford St. Martin gives Mary as Mary Summerton. I understand that the family name was actually SOMERTON.

Notes from the Will of Mary Soden, written in 1832.
(223.369)

Currently living in Oxford
All funeral and personal expenses to be paid by the executors

To son John, gardener at Barton, all the garden and the land on which he has
erected a dwelling house, pasture etc, except for one hovel in the garden
which belongs to another part of the estate

To William Faulkner of Sesswells Barton and John Soden, the cottage, orchard
and garden, occupied by myself and Richard Gardener, to be disposed of as
soon as possible and the proceeds divided into three:-
- One third to my daughter Elizabeth Edwards of Middle Barton (widow)
- One third to my daughter Susanna, wife of Francis Padbury, a victualler of
Oxford
- Remaining third to Francis Padbury to be invested and trust funds set up
for the children of my late daughter Mary, wife of Francis Knibbs of
Westminster, victualler, until they reach 21

To William Faulkner and John Soden the property, now occupied by William
Hiatt, to sell and invest the monies for my grandchildren

Everything else to William Faulkner and John Soden to dispose of and divide
the proceeds into three between Elizabeth Edwards, Susanna Padbury and
Francis Padbury for Mary Knibbs' children.

Signed Mary Soden
Witnessed James Griffiths, Robert Wharton, Elizabeth Clifton
Executors William Faulkner and John Soden

(NB William Faulkner was a farmer at Purgatory Farm and Home Farm, Middle
Barton)

From the will of her mother Mary Soden, we can assume that Elizabeth married a man named Edwards, but he died before 1832.

I have the following information that has been given to me by Mary Prentice, a descendant of the Fortnam family:

John SODEN married Elizabeth FORTNAM on 9 Apr 1817 at Steeple Barton, Oxfordshire. She was the daughter of George FORTNAM and Ann AUSTIN. She was born abt. 1796 in Middle Barton, Oxfordshire and died in Marston Street, Cowley Road (which I think is in Oxford itself.

They had the following children:
Marianne, b. abt 1817
Elizabeth b. abt 1819
Caroline Elizabeth b. abt 1820
John b. abt 1823
Wiliam George b. abt 1824; d. 1824
Eliza b. abt 1825
William George b. abt 1827
Susannah Sarah b. abt 1828
Ann b. abt 1831
Maria b. abt 1831

It seems that they were all born and baptised in Steeple Barton, Oxfordshire.

From the will of her mother Mary Soden, we can assume that Susannah married a man named Francis Padbury, a victualler of Oxford.