Thanks Heywood,
I found him also in an institution on the New York census 1925, see link below:
age 5 listed as an Orphan and residing at The Sorrowful Mother Orphan Home, 27 Harrison Place, Brooklyn - it states that Christopher was first admitted to the Orphanage on November 08, 1923.
https://www.familysearch.org/ark:/61903/1:1:K91Z-S58From those dates I can assume that Denis Doyle must have died in New York sometime between the 1920 census and October 1923. I have not found a record of his death yet.
Yes I believe he was the son of Denis & Delia Curry.
I found a death record for Christopher in Hicksville in June 1992, it states he was born in May 1920, so Delia must have been pregnant at the time of the 1920 census - presuming the census date was prior to May 1920.