I think we have corresponded before.The Robert Aitken b 1829 who married Annie Aitken New Monkland died in Falkirk in 1886 - I have his death certificate.It lists his parents as William Aitken & Helen Grindlay.This information was supplied by his daughter in law who probably got it wrong.I think his mother was Helen Galbraith.Annie Aitken was born in Down Ireland.
From Tom Paterson's wonderful website, here they are in the 1881 census.You can see the children listed as well.
Family: 1503 Address: Jawcraig 19 GRO Ref: 479-2
Census Place: Falkirk, Stirling, Scotland Enumeration: Dist 12 Page 18
SURNAME FORENAME RELATION STATUS AGE SEX OCCUPATION WHERE BORN
AITKEN Robert Head M52 M Coal Miner Falkirk, AITKEN Ann Wife M50 F Down, Ireland AITKEN James Son U 20 M Coal Miner Bathgate, Linlithgow AITKEN William Son14 M Coal Miner Bathgate, Linlithgow AITKEN AnnDaur 11 F Scholar Airdrie, Lanark AITKEN JohnSon 5M Scholar Falkirk, Stirling, AITKEN Thomas Son 9 M Scholar Airdrie, Lanark,
It looks like you might not have the earlier generation correct unless there were 2 Robert married to 2 Annies and they both named the children the same way.
Let me know if you would like a copy of the death certificate. I also have the marriage certificate for Robert & Jane Kerr and Robert's brother James to Eisybelle Sharp 1883.
They are not my Aitkens but I always keep them in case.