The 1851 census reference appears to be for Patrick district 6, entry 35, Ballakearney, Foxdale.

The birth place of all the children was given as Patrick, not Marown, though the baptismal records are all at Marown. As Charles was a miner they were probably all born in Foxdale.

James aged 1 was baptized 22 April 1849 at Marown, so he was actually aged 2 at the census.
I think the James bp 21 Nov 1847 probably died in infancy but I have not found a burial for him.

I notice Catherine Brew aged 87 in 1851 is listed as mother-in-law instead of mother.