Hello! I found a John
Lafferty born about 1828 from
New York married to
Harriet Lafferty born about 1831 from Ireland in
Pierpont,
Ohio in the 1880 census. The estimated marriage date is 1851. John was a blacksmith. There's a daughter, Matilda, born 1860, living with them. Her occupation is listed as keeping house.
I searched some Ashtabula records and an 1870's map with all the land owner's names on it. I found 2 Marsh's in southeast
Pierpont, but none of the children I found for either was Sarah. One
Marsh was D. and one was L.D
Marsh living in adjoining properties.
I've not found any records of either Sarah or Helen. Could they have possibly died from childbirth complications and that's why what you know and what the record says are so similar? I hope something here helps and I'll continue looking.