Hello Dixon,
Here is the 1841. census for Calder Braes, Old Monkland, i am sure this is Mary Boyle, after she was married to George McMillan.
McMillan George M. age 30 years, Iron Stone Miner, born Ireland,
McMillan Mary, F. age 40 years, born Ireland,
McMillan Mary, F. age 10 years, born Outside census County,
McMillan Ann, f. age 7 years, born Outside Census County,
Crow William, M. age 15 years, Iron Stone Miner, born Outside Census County.
There is no sign of Jane Crow, with the family.
George Mcmillan, and Mary Boyle, had two daughters called Mary, and Ann, both born in Dundonald, Ayr. so that ties in with the family, also both George, and Mary, were born in Ireland, that also concurs with the information from the other site, but the important thing is William Crow, aged 15 years, John Crow, and Mary Boyle, according to the other site had a son William Crow, born in Ayr, about the same age as this William Crow.
Regards,
Jonn.