You're doing a paper on Pennsylvania history and your grandmother told you some great stories about how the town was different 60 years ago. Do you need to cite this information?

No

Explanation:

You do not need to cite general knowledge information or a piece of information coming from a private person known to you.

You only need to cite if you use information from a particular source, for example from a text, a book or a written account. There, the name of the author of the piece of information will appear and you must cite it to avoid plagiarism or copying somebody else's words or work.

Your grandmother's stories are considered to be common knowledge, therefore there is no need to cite them.