On the census entries Sarah is consistantly a lot younger than Michael. On 1851 she is 39 and he is 55. So her birth approx 1812, so cannot be marriage of 1811.
that is unless he married 2 Sarahs

He would have been only 15/16 for 1811 marriage.
There is a marriage 1825 on Familysearch;
Michael KENDRICK to Sarah CHANT
5 Sept. 1825, St Peter or Collegiate, Wolverhampton,Staffs
What is the birthdate of first child you have?
Is this the same census you have?
1851 has children as; David 19, Isiah 15, Sarah 9, Michael 7, Harriet 5, Jesse 3, William 1.
Trish