You have George and Ann Jane's marriage?
If not, this took place in St Andrew, Barnsbury, Islington on 12 April 1875. George is showing as a widower, aged 42 and a Hackney carriage driver (as he did on the entry Rosie found for 1881).
His father is given as George Lambe, cabman, deceased.
Bride Ann Jane Cross, 27 and a spinster. Her father showing as Philip Cross, deceased and a miller by occupation.
So, son William who shows as aged 11 in 1881, was mother George's first wife?
Monica