With every telling of a story or a family tradition, details can change. Sometimes those details are not all that significant. Sometimes they are and change the entire meaning or implication of the story. When someone tells you a family tradition, remember that the original incident could vary quite a bit from what you are told generations later. Record it as you are told it. Indicate who told you it and when.
But remember that any detail in the tradition may not be true.
Consider them clues.