According to the 1851 census it states that Johns wife - Elizabeth - was born in Holt, Denbeighshire. I think the spelling on the 1851 for Denbeighshire is wrong as they have it as Derbishire. On the 1881 census it shows that their son James was living in Holt.But not with relatives. Could it be that he went there to find his relatives.I can not think why else he would go there, unless to find his mothers side of the family. I can not find a marriage there of a John Rothwell to an Elizabeth.