Do you automatically believe all claims made by all people, or do you have an hierarchy of acceptance?
If the latter, would you put your granny above or below evolutionary biologists, zoologists, etc?
I have a hierchy
I don’t see why the opinion of evolutionary biologists, zoologists, etc., there is nothing that contradicts the existence of a big ape with big feet..
It depends on the testimony , if she says that she saw a distant shadow that moreless lookes like a big ape, her testimony won’t count much
If she directly saw the ape, and even played with it, her testimony would be much stronger
If other independent witnesses where there and testified the same thing then the testimony would be much stronger to a degree of nearly 100% certainty
You do realise that every person has the innate ability to experience delusions that seem absolutely real to them? This is a vitally important point in understanding stuff like miracles, visions and other claims of "religious evidence". Then there is pareidolia and the like.
What you would actually have to do is establish that your granny's experience was not a misunderstanding or delusion.
Its all about probabilities
1 the probability that there is a big ape in the forest (and my grand ma saw it)
2 vs the probability that she is having hallucinations.
It´s hard to put objective numbers to each of these probabilities, but at least intuitively one can tell which probability is higher.
If she saw an ape, played with him and other people saw the same thing, then 1 woudl be more likely than 2.
If she saw a distant shadow, that moreless looked like an ape, then 1 would seem more likely.