This is your family so it looks like they married in 1901/2

SULLIVAN, James Head Married M 32 1879 House Demolisher London St Lukes
SULLIVAN, Mary Wife Married9 years F 28 1883 Shirt Ironer London Hoxton
SULLIVAN, Mary Daughter F 7 1904 School London Hoxton
SULLIVAN, Kate Daughter F 4 1907 London Hoxton
SULLIVAN, James Son M 1 1910 London Hoxton

RG number: RG14 Piece: 1345 Reference: RG14PN1345 RG78PN46 RD16 SD1 ED24 SN176 Registration District: Shoreditch Sub District: Shoreditch South Enumeration District: 24 Parish: Shoreditch Address: 26 Britannia Street Hoxton County: London