Children
1848 - Mary Ann Sillett - Market Downham, Norfolk
1850 - Keziah Sillett - Huntingdonshire - Died 1851
1852 - George Sillett - "Spring Garden", Lincolnshire
1854 - Keziah Sillett - East Grinstead, Sussex
1857 - William Sillet - Borden, Kent
I think this is the family in Lincolnshire in 1851. Although the ages are completely wrong, the birthplaces are very coincidental

HO 107/ 2103/285/5
New Street, Manthorpe cum Little Gonerby
William Siller, head, m, 38, laborer, Suffolk Crowful
Elizabeth do, wife, m, 35, Norfolk, Market Downham
Sophia do, dau, unm, 7, Essex ? Wiford
Mary Ann do, dau, unm, 2, Norfolk, Market Downham
Kasiah do, son, unm, 1, Huntingdon
Burial,
Keziah Sillett of Little Gonerby, 28th April 1851* at St Wulfram's Grantham.
*Died only a few weeks after the census was taken.
Possibly William's birthplace is Crowfield? near to Crowfield are Little Stonham and Stonham Aspal. Might these be 'Starmond' in 1871?
https://www.genuki.org.uk/big/eng/SFK/Crowfield