Ray,
How sure are you that William was born in 1850 Kirkintilloch Dunbartonshire?
Found this family on 1851 Census living at 10 Well Street, Calton Glasgow
Taylor John Head 31 Hand Loom Weaver Cotton born Paisley, Renfrewshire
Taylor Caterine Wife 32 Steam Loom Weaver Cotton "
Taylor Mary Dau 15 Peacer born Calton, Glasgow
Taylor James Son 9 Scholar "
Taylor William Son 2 "
The family have 4 adult lodgers and a child John Duffie aged 2 noted as an adopted son but it's not clear if he is the adopted child of the Taylors or one of the lodgers.
Also living a stone's throw down the street are this family
21 Well Street. Calton, Glasgow
Miller George Head 30 Cork Cutter born Paisley, Renfrewshire
Miller Hellen Wife 28 Semstress born Glasgow
Miller Margaret Dau 6 "
Miller Agness Dau 2mths "
Miller Hellen Dau 2 "
This family have a visitor an Alexander Christie aged 35 a Cork Cutter living with them.
Could this be the William Taylor and Agnes Miller who marry in 1872?
Looby
