wonder if this is any help?
john shearer born around 1798
margaret pettigrew born 24/12/1803, bothwell, daughter of james and catherine. james pettigrew was born around 1777 bothwell and catherine born around 1881. they also had a son william born 19/8/1807 bothwell.
back to the shearer family:
george born august 1820, married barbara letham on the 31/12/1843, barbara was the daughter of robert and janet urquhart
barbara and george had children
janet-4/8/1844, she married alexander miller 11/8/1964
john-28/6/1846, john died 8/9/1915
george shearer passed away on the 26th august 1846 in garthamlock, he was buried in the old monkland churchyard and parish.
other children for john and margaret:
catherine- 7/5/1824
mary- 15/6/1826
john- 29/9/1828
william- 8/9/1830
margaret- 26/10/1832
alexander- 1835
robert- 1837
margaret- 1838
agnes- 27/6/1840
david- 1/4/1842
david- 9/4/1844
now the census
1841 census; cuilhill, old monkland
john...age 40...engine keeper
margaret...age 40
george...age 20...engine keeper
james...age 15...coal miner
catherine...age 14
mary...age 12
john...age 10
william...age 8
alexander...age 6
robert...age 5
margaret...age 4
agnes...age 6 months
1851 census; dykehead, old monkland
john...age 53...engineman
mary...dau...age 25
john...son...age 22...engine keeper
william...son...age 19...engine keeper
alexander...son...age 15...labourer
margaret...dau...age 12
agnes...dau...age 9
david...son...age 5
catherine pettigrew...mother-in-law...age 60.housekeeper...born shotts
by 1861 the whole family is split and is difficult to pinpoint, will keep trying
Joe