Here are the Horsfalls in 1901, with Annie working as a confectionary packer:
1901 census ancestry
Aren't ancestry giving free access to the 1911 census at the moment, OC? (though you have to log in)
Albert is "adopted son" and Clarence and Alwyn "son" on the 1911 census. Also Annie says she has 2 children of the marriage, both living.