Notes Baptism and marriage record name is Albrecht Friedrich, census records/probate John Roth but deceasedonline has Bernard Albrecht.
Marriage to ID 27804 Sophia Barbara M Vogel at the German Evangelical Church, Islington. Her sister Maria Margaretha Barbara Abel nee Vogel is the mother of Frederick Abel who was assisting John Roth in the 1901 Census. Also assisting on this census was ID 27800 Fredrich Haag.
Children William Frederick 1888-1956, Albert 1889-1891, William 1891, Albert 1893-1946, John 1897-1963, George 1902-1968 and Bernard 1906-1975.
1891 Census Babette Vogel 13 is helping out. This could be the daughter of John's wife. In Babette's marriage record to ID 335 Heinrich Henne her name is given as Sophie Babette Roth but in other records is Vogel.