Hi Gadget,
Only things I know about John Grant are: he lived in Wrexham, he was born in Scotland in 1821, in 1851 he was a tea dealer, in 1871 he was a lime agent, he had a brother Charles with him and his family in 1851[born 1830]. Nearby in 1851 lived more Grants who were tea dealers, James 1815, William 1825, Elspet 1819[she was down as housekeeper], possibly John's bros and sis.
Thanks Rosanna