Susan Wade had the following siblings
• Eliza / Elizabeth born in Ireland abt 1828
• Robert born in Glasgow in 1832
• Catherine born in Glasgow abt 1835
Elizabeth Wade married James McKay
This is her in 1851 (Note her younger sister Catherine in with her.)
https://www.freecen.org.uk/search_records/5a150270f4040b9d6e0c8d55/cathrine-wade-1851-lanarkshire-glasgow-1835-?locale=en(click on link to open)
There is a death for an Elizabeth (Wade) McKay died in 1890 Bridgeton. Age 59
Mother’s maiden name is Duncan in the index. The certificate is needed to know full parent info.
Robert Wade’s baptism can be found on Scotlands People in the Roman Catholic Register
WADE ROBERT
parents - ROBERT WADE / CATHERINE DUNCAN
MALE 10/3/1832
23/3/1832 GLASGOW, ST ANDREW'S
I have not yet looked to see what became of the sister Catherine.
I think probably both parents died between Catherine’s birth and the 1841 census, which is why you see 8 yr old Robert working in the tobacco trade in the 1841 census.
Remember that ages in the 1841 census were rounded down.