USC 1880 Lacy, Mahaska co.,IA
heres exactly what the USC entry is for Rosella and her three sons, I had it both printed out and in my database.
"Joseph H.w-M-25-son -single-bp:NY
"Robert P.w-M-22-son -single- bp:IA
"Albert N.w-M-17-son -single- bp:IA
so using these ages we get birthdates for each person of:
This would mean that Rosella was late teens when she married Martin, Son Joseph was born in NY C1854/55.
All these are within norms, next child born was Robert and that indicates he was born in Iowa so that narrows down the migration pattern to between 1854-1858.