Hello Jane,
I guess you have this but just in case ...
It looks as though both Polly (5 in 1871) and Ralph Nelson (3 in 1871) died in 1874.
Possibly leaving WIlliam (11), Henry (9), Elizabeth (7) and Annie (2) surviving after the death of their mother. Do you have them in 1881?
There's the birth of a Ralph Nelson DAGGETT in York in 1893. And on the 1901 census there's an R N DAGGETT, age 9, with father Henry DAGGETT, 38, Railway Engine Driver, and family.
JAP