Another brother possibly -
John Jackson born abt 1804 Market Bosworth (also a farmer) married Ann Williams in 1848 Chippenham Wiltshire. This marriage has his father as John Jackson a Yeoman.
I have had a better look at this John and I am more convinced he is related to this same family.
There are 2 adjoining farms in Market Bosworth - The Common and The Pastures / Cow Pastures.
The Pastures is farmed by William Jackson for many decades. His brother Thomas is with him for a while up to abt 1841, but then moves off to farm elsewhere.
John Jackson is farming next door at The Common in 1851 and 1861. By 1871 he has moved to a larger farm at Newtown Linford
.. He died Market Bosworth 1895. I think the same John is at The Common also in 1841 census with head of house, Elizabeth Jackson age 65, a Farmer. There are a couple of other names listed who I think must be farm workers. The census record is very pale and v difficult to read.
Who is this Elizabeth Jackson - could she be the mother? I don't see her in the 1851 census.
I can only find 1 death not an exact fit with the census age, but ages on the 1841 census were rounded down & tend to be approximate. I'm inclined to think it is the right one though.
Death rego
JACKSON, ELIZABETH Age 75
GRO Reference: 1848 J Quarter in MARKET BOSWORTH Volume 15 Page 122
(I think the £2.50 digital certificate is the best option)