In the April to June 1874 birth index, Frederick Hart, St George Hanover Square, London, Middlesex, volume 1a, page 348.

In the 1881 census living at 2 Dorset Street, St John the Evangelist civil parish,, London, St George Hanover Square Registration district, St John Westminster.
Joseph Hart age 46 born in India, musician. [There is a discrepency between his age and birth place for the 2 census]
Wife Elizabeth Hart age 46 born at Hounslow.
Son Joseph Hart age 21, born at Hounslow, postman.
Daughter Hilda Hart age 15, born at London, needlewoman.
Son Frederick Hart age 7, born at London.
They had a lodger.

In the 1891 census at 44 Cumberland Street, St George Hanover Square London,
Henry John Simmonds married age 30 born at Hounslow, Middlesex, occupation Musician Scots Guards.
Wife Amy Simmonds age 28 born at St John’s Heston.
Daughter Ruby C Simmonds, age 4 born at St Geo. Han. Sq. London,
Daughter Gladys Ivy Simmonds, age 2 born at St Geo. Han. Sq. London.
Son Charles H. Simmonds age 1 born at St Geo. Han. Sq. London.
Cousin Frederick Hart age 17 born at St Geo. Han. Sq. London occupation Boy Printer.