So, for my sake! A brief summary of what we have from this evening.
Bridget Thomson born in Ireland, came over to the Glasgow area with parents Andrew and Margaret. She married a George Duff in Glasgow in 1862. She also had a daughter that year with George Duff. No more children showing for them. Not clear whether George Duff died or abandoned her with child.
In 1868, Bridget gave birth to John Thomson at Barkhill Workhouse (you have this cert).
1871, Bridget is with her parents and sister Mary. Also with her are Susan Duff, daughter, and son John Kennedy. We can normally assume from this that reputed father was also a Kennedy (maybe even a John Kennedy?).
1881, she is showing as housekeeper (Bridget Duff, widowed) in the household of a Hugh Cairns. With her is son John Thomson.
1888, John married a Mary Ann Black. She died the following year. A daughter, also Mary Ann, born in 1889. Toddler Mary Ann showing as adopted daughter and living with maternal grandmother in 1891.
We haven't found John in 1891 census before he married.
He married Charlotte Campbell in August 1891, showing as widowed.
We haven't found John Thomson in 1901 or 1911. Charlotte has been found in 1911, no sign of John in the household but with her are five children. The children are those born from 1901 to 1910. They sadly lost 6 children over the years.
Have you found John's death reg? Sancti looks to have found Charlotte's (not sure if you had this already).
Monica