Do you know if he married and whom.
There is a Joseph John SPARROW marriage at Stepney St Philip, on 25 Sep 1892 to a Clara Isabella HILLS. He was 23, so birth c1868-69, and his father was Joseph John SPARROW. In 1901 he was 33 and birthplace given as St Lukes, which came under the Holborn RD at one stage.
Ian C