In the attempt to “prove everything,” some genealogists assume Grandma was wrong about everything she said.
The reality is that the truth sometimes rests in between.
My own Grandma insisted she “remembered” her baptism. I never argued about it, but people raised in the Lutheran or similar faiths typically are baptized as infants. That makes remembering difficult.
When I located the record of Grandma’s baptism, it turned out she could have remembered it. She and two of her siblings were all baptized on the same day when she was five. The minister even came to their home to perform the ceremony.