You've asked a primal question in Genealogy, and it is a carbon copy of the most important question asked in Philosophy: "How we can determine what is the Truth?"
Do you have enough information to confirm? Probably not.
However, further investigation is always merited.
Documents are made by humans; they are not infallible, sometimes they are outright lies. Versions of "Reality" are always questionable, or at minimum limited, when they derive from humans.
Genealogy currently doesn't much care about "having 3 documents" -- sometimes documents are wrong; carbon copies of a mistake, or just more outright lies. Never trust a document.
Genealogy is now about Evaluation and Validation of Evidence. We cannot understand absolute truth (most probably), so what we need to do instead is exhaustive research, exclude suppositions that are clearly unsupported, and keep suppositions that can be fitted with corresponding, independent data in context. It's an ugly, sweaty job.
Trust nothing. But therefore, exclude nothing.
Follow the lead, like a forensic detective. Your situation looks juicy to me. Could be great fun. Could lead to a better understanding of your family history. Maybe it's wrong; maybe it's right.
Keep up the fine work, and keep looking for the traces of their existence.