Thank you for finding the 1921 census on Ancestry. Someone certainly made a mess of the transcription!!
I have researched the family extensively and as follows.
Alice married Robert Crowther and they lived at Port Sunlight. The family folklore said Alice and her husband died and the two children were re-homed with Alice's father and second wife and a brother and his wife. I found that Robert died in 1913 and that they had three children. In early 1914 Alice went to Canada where she had an older sister. Alice re-married in Canada (Joseph Mulvaney) who then died at Vimy Ridge in World War One and is commemorated there. Alice died not long afterwards from alcoholic poisoning. Joseph left instructions for money to go to England for Alice's children but the Canadian military refused. Robert and Alice's son stayed, so far as I know, with his grandparents while his sister, Kathleen, went to her Uncle Roderick when he married and was raised with their own son. No-one knew about the third child (Robert Lionel Crowther) I found and I have been tracking him. I believe Alice may have intended to return to the UK or send for her children but World War One got in the way. I suspect the youngest child went to his father's family and was 'lost' to the Hume family.
It is a sorry tale .............