The majority view is that Claude Dugas was Amand Dugas' father.There is a minority view that Joseph Dugas was the father.Unfortunately with events this far in the past, resolution is not that simple.
You may want to check these sources as they may have some clarification (or may just add fuel to the fire):
Author: Arsenault, Bona, Histoire Et Généalogie Des Acadiens, (Éditions LEMÉAC Inc. Ottawa 1978)
White, Stephen A. Dictionnaire Genealogique des Familles Acadiennes. Le Centre d'Etudes Acadiennes. Universite de Moncton: 1999.
Often when a genealogy goes back this far, there are several conflicting sources of information.Sometimes there are conflicting parents, conflicting spouses, dates, etc.You should just take it all with a grain of salt and enjoy what you have; none of it is for certain unless you have some form of primary documentation.