My family tree does not have your Horace & Colin, but has
John Thomas Allen, b.1874 Sheff, d.1962 Roth.
Wife Sarah Hardy (no other details)
Son Cyril 1918, wife Elsie Smith.
Cyril & Elsie's Children. Doris 1920, Horace 1923, George 1925, Joan 1927, John 1930, Elsie 1934 and Sandra 1943.