The only census I can find in 1861 is the one Pam posted, the family are also there in 1851 - 113/114, Glengnock Iron Works, Kilbirnie, Ayrshire. Joseph's place of birth Old Monkland, Lanarkshire.
I am just wondering if they both became Ships Engineers between 1861-1871, the jobs would be related?
However that might be a little irrelevant because more importantly I cannot find a birth record on Scotland's People for Joseph around 1845 anywhere in Scotland?
Colin