From the information you posted earlier on and I added to:
1. We have a Margaret T Butler who shows as born in Glasgow between 1838-42. We have children showing to her and a Thomas Bryson Butler Snr. from 1857. Still to find her in 1861 census.
2. We have found a marriage between a Thomas Bryson Butler and a Margaret Thomson Reid in 1866 in Glasgow. If you viewed this certificate on Scotlands People it would give you some information on Thomas B Butler Snr. about who we know nothing about at this stage (age, occupation, his parents' names etc). We would also be able to confirm details about Margaret and verify what we are seeing regarding her in respect of age and hopefully find birth/family details for the two of them.
3. We have Margaret with the children in 1871, still no sign of husband Thomas in Clackmannanshire. Then Edinburgh for the 1881 census and London for the 1891 census.
4. We then have a Thomas Bryson Butler marrying a Charlotte Griffing in Marelybone London in 1888.
A Margaret Violet was born to this couple in 1890 and we have found a likely birth entry for her in Gloucestershire (which matches what we can see on the 1891 and 1901 censuses). In 1901, the family are living in Edmonton, where Margaret V. marries in 1910.
5. The age of Thomas Bryson Butler, husband of Charlotte, matches the age (only a few years out which is not unusual) of the Thomas born in Glasgow in 1857 to parents Thomas Bryson Butler Snr. and Margaret T Reid. The only mistake I can see on the 1901 census is that place of birth for Charlotte and Thomas has been entered the wrong way round - Charlotte is showing Scotland and Thomas is showing Camden, Gloucestershire. I think this is simply an error, and the info is correct on the 1891 census. You might want to try and find Thomas and Charlotte on the 1911 census for further info, including his occupation at that point (we have seen a couple of changes for him over the previous censuses).
6. At this stage, we have no info whatsoever on Thomas B Butler Snr. - can't see a death for him in Scotland when I looked. No idea whether he was actually born in Scotland, can't see him in the earlier censuses as yet in Scotland. Only that 1866 marriage cert will give you some info on him (and Margaret wife) at this stage.
Pam, I do think we have been following the generations in order and bar a few mistakes on the way info has been entered, everything that we have found so far does point to the right family for Margaret V (parents and paternal grandparents).
Where does the reference to Govan for Margaret come in?
Monica