On the 1841. census for Govan, Lanark,
Address Knowehead, we have this family.
Hunter William, M. age 30 years, Wright. born outside census area,
Hunter Catherine, F. age 30 years, born Lanarkshire,
Hunter Jean, F. age 11 year, born Lanarkshire,
Hunter Robert, M. age 10 years, born Lanarkshire,
Hunter William, M. age 8 years born Lanarkshire,
Hunter Mary, age 6 years born Lanarkshire,
Hunter Catherine, age 2 years, born Lanarkshire,
Young Robert, M 20 years, Gardener, born Lanarkshire,
Young Robina, f 20 years , born outside census area.
The 1841. census the ages of adults were supposed to be rounded down to nearest whole number.
I know the ages of William, and Catherine, are a bit out going by the 1851. census, i am almost certain this is your couple.
William, is a Wright, same job as sawyer, or carpenter, the children are correct.
On this census Catherine is born in Lanarkshire, so its possible the wrong birth location on the 1851 census.
If her birth location is indeed lanark then there is a possible birth for her which could knit things together.
Catherine Weir, born 28/Feb/1805. Glasgow, Lanark, to parents Robert Weir, and Janet Alexander.
William, and Catherine, have children called Robert, and Janet.
I would be going all out to find Catherine Weir's, death certificate provided she died some time after 1855. which should verify her parents names.
Regards,
Jonn.