I tend to believe that this is Margt Hughes named in the 1851 census with John at School Wynd Paisley and we have James and Margt from this family have both declared their parents to be John Hughes and Margt Madden (per marriage certs) plus we have a daug Mary as the informant on Margt's death who appears on the 1851 census.
I would think the daug Ann on this census would be more likely to be Roseann than her sister Ann said to be born in 1830. I know we're hanging on by our fingernails here and actual proof is eluding us but there is some consistency in the mix...discounting some wild guesses by informants.
It was very cruel that by sheer coincidence the death of a Margt Robertson should occur in 1875 and a subsequent marriage of John Hughes to Helen McCormick in 1976...that threw us out completely! I have not a clue how 'Robertson' got into the mix of surnames...but I think the name McCormick is related in some way, most likely on the McManus side of things.
You might never resolve this to your satisfaction Kizzy but we've sure given a good crack.
