Hi Katherine

Not sure if this is of any help with your search. I looked for the youngest Cooper child - Ida Cooper on the 1911 Census. The one I found was Ida Cooper age 10 born abt. 1901 Nottinghamshire. The Head of the household is Elizabeth Day Cooper age 56 - she is a Widow - Newsagent born Baythorpe Village Nottinghamshire. The children living with her are John Charles Day age 36 - Annie Day age 25 - Frederick George Cooper age 19 - Arthur Cooper age 17 and Ida Cooper age 10. All children born Nottinghamshire.
They are living at 18 Machine Street Nottingham.

Could it be that in between 1901 and 1911 Census Elizabeth lost her husband - remarried and then lost that husband??

Hope this helps.

Regards Norma