Because I am getting so worried that we are all focusing on John Davidson, bootmaker, born Scotland and that it may still be the wrong path, and it's quite hard to keep up on all previous replies, here goes with what I think I've worked out:
The only thing that is certain is the 1911 Census with John T Davidson born 1868, Chelsea. Wife is Annie Lister.
Then I looked at the other census already mentioned and so briefly so that someone else maybe able to either confirm or dispel my doubts:
1861 John snr, born Glasgow, shoemaker
1871 John snr, born Scotland, shoemaker
John jnr, born Manchester, 1869
1881 John snr, born Scotland, shoemaker
John jnr, born Manchester, 1869
living Primrose St.
1891 John snr, born Scotland, shoemaker
John jnr, born Manchester, 1869, shoemaker
living Blossom St.
1901 John snr, born Scotland, boot/shoemaker
John jnr, born Manchester, 1869, boot/shoemaker
living Blossom St.
1911 John jnr, born Manchester, 1869, boot rivetter
Mother Annie, widow, born Manchester
living 9 Cowlishaw St.
