I'll answer your other questions as best I can Annie
Where are those children in 1841?
I haven't been able to find either Agnes/Nancy, Mary, & John in 1841. And i've not been able to locate their baptismal records. Maybe those events just weren't officially recorded?
'Mary, on her marriage in 1856 is aged 22 (b c1834)', yes, her husband is listed as 21 on the Marriage record, but he was actually 20 as he was born 16/11/1835.
What info. is given on Mary's death re parents?
This is the info given on Mary's death record, by her son, Daniel McCormack.
Died 22nd April 1895, Age 58, Widow of Daniel McCormack (Packing Box Maker). 518 Rutherglen Road, Glasgow. PARENTS - John Fleming (Carter - Deceased) & Margaret Fleming ms Osmond (Deceased).
Where does Mary state she was born 1861/71/81 etc. until last census prior to death?
1861 - c.1837, Glasgow.
1871 - c.1834, Glasgow.
1881 - c. 1836, Glasgow.
1891 - c. 1836, Glasgow.
Side Note - in 1871, Elisabeth Fleming (Mother in Law) also residing with the McCormack family. Age - 63 (c.1808), Montford, Forfar.
What children (if any) are still at home with Elizabeth 1861?
In 1861, Elizabeth is listed as Mrs Fleming (55), Danie Mccormick (24), Mary Mccormick (24), Mary Walter (27 - Boarder), Mary Mccormick (2)
I haven't been able to find any marriages or deaths for Agnes & John. I have done many searches for them. I cannot find Agnes/Nancy in 1861, so i assumed she either married or died between 1856 and 1861, but haven't been able to find either.
What led you to Ossman (whichever variant) in the 1st place?
Well, my first clue was Mary's death record which gives her mothers name as Margaret Osmond. Though I knew this didn't fit as I had records with her mother's name as Elizabeth. On Mary's marriage record it is Elizabeth *man. On Elizabeth's death record in 1877, Mary gives her mothers maiden name as Ossman. On the marriage record for Elizabeth's parents Robert & Margaret, the name is transcribed as Osman.
Daniel McCormick & Mary Fleming also had an illegitimate daughter, who they named Elizabeth/Elisabeth. She died 26/05/1855 age 13 months at 125 High Street. The informant was Elizabeth Fleming (Grandmother)
Keelan