I think this could be Joseph as he has a sister Julia
1881 census
20, Wentworth Court, Spitalfields, London (Middlesex)
Nathan Joseph, 50 (b.c. 1831 Holland), cook, wife Isabella, 49 (b.c. 1832 London, nee Solomon(s))
children
Woolf, 15 (b.c. 1866 London) cabinet maker
Joseph, 17 (b.c. 1864 London) confectioner
Isaac, 13 (b.c. 1868 London)
Leah, 11 (b.c. 1870 London)
Julia, 7 (b.c. 1874 London)
and in 1871
6, Old Castle Street, Whitechapel
Nathan Joseph, 41 (b.c. 1830 Amsterdam, Holland), pastry cook, wife Isabella, 37 (b.c. 1834 Aldgate, Middlesex)
children
Henry, 14 (b.c. 1857 St. Mary le Grand (Strand?))
Sarah, 12 (b.c. 1859 Spitalfields), machinist
Aaron, 10 (b.c. 1861 St. Mary le Grand (Strand?)), scholar
Deborah, 9 (b.c. 1862 St. Mary le Grand (Strand?)), scholar
Joseph, 7 (b.c. 1864 St. Mary le Grand (Strand?)), scholar
Woolf, 5 (b.c. 1866 Mile End New Town), scholar
Isaac, 3 (b.c. 1868 St. Georges in the East), scholar
Leah, 1 (b.c. 1870 Whitechapel)
and sister in law Sophia Solomons, 22 (b.c. 1849 Spitalfields)
a servant Mary Ann Robinson, 18