I know this isn’t Q or news related but I received a weird letter in the mail that claims it’s from a family member, but doesn’t say who. The return address was filled out with my address. Is there any way of figuring out who may have sent the letter? Would the USPS the package was mailed from be able to tell me?

Edit: This definitely came from someone I know. They know me and my child’s name and they were warning me of some other family members but didn’t give any names of who they were talking about or who they were.