John sellwood born Salisbury 1828

[ciderdrinker]

Yes
Her father is down as John Williams house painter.
However her step father was Samuel Williams  a coach smith 1837- June 1877
And it is John Sellwood who is a house painter.

I've dug a bit deeper through John Sellwood marriages from 1844-1862 for the first wife.
There is a John Sellwood ag lab born 1831 Tilegurst Berks
 Marries firstly Pheobe Fuller June 1852 Bradfield Oxfordshire ,Berks .Pheobe dies Sep 1855 and
John remarries Mary Ann Oliver at Reading Mar 1859

Neither marriage seems to be available on line to find his father's details are Benjamin Sellwood.

1871 census Tilehurst Berks
John Sellwood  42 ag lab Theale
Mary 45 worker paper mill Kelston?
Elizabeth 17 Tilehurst
William 13 Theale
George 7 Theale.

Not spotting family together after that bur really picking at straws.

Ciderdrinker

[Milliepede]

Baptism 17 Jan 1830 for that one with father Thomas Selwood mother Sarah

With parents in 1841/1851 so no Benjamin there I’m afraid

[jonwarrn]

Even if John can't be found before the marriage to Ann, there ought to be a death record for him.

Her father is down as John Williams house painter.
However her step father was Samuel Williams  a coach smith 1837- June 1877
And it is John Sellwood who is a house painter.

Cidey, I don't understand this. John Sellwood was Agnes's father.
Samuel Williams died three years before she was born.