I’ve been conducting some additional research. Marriages from the Cullen family have led to the following additional last names besides Cullen, Manning and Green: Martin, Foran, Adams, and MacDonald.

I cannot find any information out about James, Annie and Cristina Cullen mentioned above. James and Annie don’t appear in the 1921 census (and I’m wondering if they were infant deaths) and Cristina last appears in the 1921 census. I’ve checked Ancestry, Find My Past and Family Search, and there are no death records for any of them (unless perhaps Cristina married).