I think I will ignore the comment from my Mother and go with the facts I have to date and thats from the Censuses.
I don't mean to sound to much of an amateur but I can not find the censuses you have so kindly located. I have searched and searched looked under the parameters of
Robert Williams Born 1823
(included then excluded Wife Margaret Child Mary and Margaret
living in Llansilin then cefn canol,
but I can not seem to find anything under either the English nor Wales Censuses 1871 nor 1881
Consequently I would be grateful if you could spell it out to me so I can see what you have found or send me a link or something
Thanks very much