Using the 1911 index, searching on surname Corris in Douglas with Lavinia Corris as 'Other member of the Household' gave this result:

John Corris 38 head
Lavinia Corris 40 wife
Druscilla Corris 12 daughter
Ella Corris 10 daughter
Maud Corris 10 daughter
Thomas Corris 9 son
Leonard Corris 6 son
George Corris 5 son
Kate Corris 1 daughter

Year of marriage 1898.
Relationships checked.

Looks like Kate aged 1 could be your Catherine Lavinia, if she was born November 1909, with her parents at that time.