Hi Jane
I have been trying to find a match to the Day family but no great success. There are 20 William Day aged 7-9 listed in the 1841 census but only 2 are also living with a William age about 40 but neither of them tie up with a Sarah. Better luck (perhaps) with Joseph - details as follows:
HO 107/709/9 sched 45
Tower Hamlets, Shoreditch
Whitfield Street
Joseph Day age 70 Toolmaker
James Day age 35 Engineer
Elizabeth Day age 41 Bookfolder
only James & Elizabeth were born in the county.
There were only 2 Joseph Day listed (aged 60-70), the other was, I think, a Chelsea pensioner.
I will give you the info on the 2 William/William matches:
HO 107/723/13 sched 15
St Thomas the Apostle
Taylors Court
William Day age 40 Labourer
Mary Day age 40
William Day age 8
Thomas day age 6
George Day age 11 mths
The children were born in the county.
HO 107/323/19 sched 31
Walthamstow
Orms Row
William Day age 35 Ag Lab
Elizabeth Day age 35
William Day age 7
John Day age 5
Elizabeth Day age 3
Henry Day age 1
parents and children all born in the county.
Regards
Mike