Looks as though your Alexander and my William were brothers. I am showing Robert and Margaret
Caddis Blane had the following children:
Alexander (1832), Mary (1834), Jean (1837), Margaret (c. 1841) Janet (1843), James (1844) William (1847) and John (1850).
My William (abt. 1848) married Annie
Gibson (Feb. 11, 1870) in
Tarbolton,
Ayr. They had Alexander (Jan. 1871), William
Gibson (Nov. 1872) and John Brown (April 1875 died Oct. 1875). Annie's parents were William
Gibson and Ann Small. William
Gibson Blane married Mary K. O'Hara and had 10 children.
There are other children listed on the 1881 census Thomas
Gibson (1868), Robert (1878) and James
Carley (1880) but I can find no further record of them.
There is a Family Group Record for a Thomas
Blane (1843) who married Annie
Gibson (1847) whose son is Thomas
Gibson Blane (abt. 1869) and I wonder whether he just visiting William
Blane even though he was listed on the 1881 census as a son. But the naming pattern isn't correct.
Contact me off line if you need anything else.