Hi Rex
re; the children of Caroline and Richard Wellington ...
In
1841;Richard and Caroline have 2 children ...Richard, 2years and Mary 1month.
In
1851 they have Richard 12, he adds up , then William who is 11...Mary who was 1month (in 1841 census) should be there in 1851, between the 2 boys...I hope I am making sense .... then in 1851 there is a Mary who is 9 so b c 1842...
Or was William, b 1840, Penzance somewhere else the night of census taking ?
let me check.
I hope I am making sense!

deb