Leggy,
I did post a reply earlier that has disappeared !
The only Isaac CHAPMAN listed in 1851 as b East Garston was:
Beenham
Bourn Lane
Isaac CHAPMAN, Head, Mar, 31, Ag Labourer, b Berks East Garston
Elen CHAPMAN, Wife, Mar, 24, , b Berks Beenham
Jamima CHAPMAN, Daur, , 1, , b Berks Beenham
George BURGHESS, Lodger, U, 22, Ag Labourer, b Berks Beenham
I've had a look at the 1841 census for East Garston and Beenham and can't find Isaac. However at the top of the page on the 1851 census is:
George CHAPMAN, Head, Widow, Ag Labourer, b Berks East Garston
Sarah CHAPMAN, Daur, , 4, , b Berks Beenham
Brother ??
In 1861 (assuming that I have the right Isaac):
Beenham
Bourne Cottage
Ellen CHAPMAN, Head, W, 35, , b Berks Beenham
Jemima CHAPMAN, Daur, , 11, Scholar, b Berks Beenham
Josiah CHAPMAN, Son, , 9, Scholar, b Berks Beenham
Ann BURGESS, Mother, W, 72, Pauper, b Amberley Sussex
William BURGESS, Lodger, Un, 47, Ag Lab, b Oxon Woodcut
Regards
Harry