From the 1891 census:-
John Quin, 41, Timber Salesman, Born St Marys, Islington
Emily Quin, 36, Born Blandford, Dorset
William J Quin, 5, Born Islington
Reginald R Quin, 1, Born Islington
Living at 68, Colebrook Road, St Peter, Islington RG12/167
Regards, Sue