Hi rcuser
This looks like William in 1841:
1841: North Petherton Somerset Hundred: North Petherton
REF : HO107/953/9, Folio: 24, Page: 8
RD : Bridgwater Sub-RD : North Petherton
ADDRESS: High Street
William ROSITER 35 Ag Lab - Y
Ellen ROSITER 30 - Y
John ROSSITER 2 - Y
A few doors back:
1841: North Petherton Somerset Hundred: North Petherton
REF : HO107/953/9, Folio: 24, Page: 7
RD : Bridgwater Sub-RD : North Petherton
ADDRESS: School Road?
James MEAD 45 Ag Lab - Y
Lucy MEAD 40 - Y
James MEAD 15 Shoem Ap - Y
William MEAD 10 Y
James ROSITER 70 - Ag Lab Y
FREEBMD had deaths of 2 Ellen ROS*ITER in RD: Bridgewater:
Dec Qtr 1847 Ellen ROSSITER
Mar Qtr 1849 Ellen Pigeon ROSSITER
I agree with you and think:
Very possible that SEALEY in 1851 is a mis-heard, and should be SAWLEY.
Maria SAWLEY had sons William SAWLEY abt 1839 and Edmund SAWLEY abt 1841/42 either illigitimately or else she was married to a SAWLEY first.
She married William BAKER in 1841 - the boys may or may not be his.
William BAKER died sometime btw 1841 and 1851.
William ROSSITER married Ellen pre 1841
They had 2 children, John abt 1839 and ELiza abt 1847
Wife Ellen ROSSITER died 1847 to 1849 (in 1847 childbirth?)
Son John ROSSITER may also have died pre 1851
William remarried widow Maria BAKER nee or formerly SAWYER in 1850 who had 2 boys.
Together they then had 3 children of their own (Charlotte, William & Honor) to add to his surviving 1 (Eliza) and her 2, William and Edmund.
Noting that in 1841, Maria SAWYER appears to be in the household of George and Honor KERLE - and she named her Rossiter daughter Honor - a connection?
Cheers
AMBLY