~1818. Born to Matthew Mason & Ellen/Helen Mitchell in Ireland. Her father had been in the Army in Ireland. Ann is given as aged 37 on the dc of her father on 12/9/1855: if this correct, then she was born between 13/9/1817& 12/9/1818! But her parents actually married in February 1819, so maybe not born until 1819, but could still be late 1818: census entries and her 1891dc support this. .
1841C Ann Mason, 20, cotton PLW, b. Ireland is living Thomson Lane, Barony, Glasgow, with her parents
| Mathew Mason | 50 | Army P. . . Cotton HLW | b. Lanarkshire |
| Helen Mason | 50 | b. Ireland | |
| Ann Mason | 20 | Cotton PLW | b. Ireland |
| Helen Mason | 15 | Cotton PLW | b. Ireland |
| James Mason | 10 | b. Lanarkshire |
Ann Mason presumably marries William McLellan 1841-1844 but no marriage found on SP. This was a second 'marriage' for him.
1851C Ann McLellan, 33, is living at 26 Savoy Street, Calton, Lanarkshire, with her husband and 2 children
| William Mclellan | 55 | Warehouseman | b. Prestwick, Ayshire |
| Ann Mclellan | 33 | b. Ireland | |
| Ann Mclellan | 6 | b. Glasgow | |
| William McLellan | 3 | b. Glasgow |
1861C. Ann McLellan, 43, head, is living 37 Coalhill Street, Barony, Glasgow with 3 children . Only found on Ancestry! No, have now found it on FMP, mistranscribed as McLillan, and Ann McLillan is given as widow
| Ann McLellan | 43 | Head . . . Cotton Yarn Winder | b. Ireland |
| Annie McLellan | 16 | Cotton Yarn Winder | b. Glasgow |
| William McLellan | 12 | Cloth lapper | b. Glasgow |
| Thomas M McLellan | 4 | b. Glasgow |
So, her husband would seem to have died 1857-1861: he in fact died 17/2/1856, so unsure who Thomas M Mclellan is!!- there is a birth of Thomas McLellan in High Church, Glasgow in 1857: this likely him, probably with Thomas Meldrum as father!.
1861-1871 Ann Mclellan will have remarried a Thomas Meldrum 1861-1871
1863. A M Mason McLellan married Thomas Meldrum in 1863, Calton, Glasgow -SP, not purchased.
1871C.Ann Meldrum, 52, is living at 29 Landressy Street, Calton, Lanark, with her new husband, and 2 children and 2 Meldrum children, James 22 & Thomas 14, both Twister . The youngest is probably also her child: I suspect he is her last child with Wliliam who has assumed the name of his step-father.
| Thomas Meldrum | 54 | Cotton Warper | b. Glasgow |
| Ann Meldrum | 52 | b. Glasgow . . .incorrect! | |
| William McLelan | 21 | Cloth Lapper | b. Glasgow |
| Ann Mclelan | 24 | Pirn Winder | b. Glasgow |
| James Meldrum | 22 | twister | b. Glasgow |
| Thomas Meldrum | 14 | twister | b. Glasgow |
1881C. Ann Meldrum, 63, is living with husband and daughter at 79 Springfield Road, Barony.
| Thomas Meldrum | 63 | Warper | b. Parkhead Lanarkshire |
| Ann Meldrum | 62 | b. Glasgow . . .incorrect! | |
| Ann Mclellan Meldrum | 32 | Winder | b. Calton Glasgow |
1891. Ann McLellan, nee Mason, 72, widow of 1] William McLellan, factory clerk, 2] Thomas Meldrum, warper, dies at 33 Fielden Street, Glasgow on 28/1/1891. Paralysis 7 days. Parents were Matthew Mason, weaver, deceased, and Ellen Mitchell, deceased. Informant: Ann Mclellan, daughter, her mark.

William Mclellan husband
Matthew Mason father