<prompt> Human: Hey all!Throw away because personal info but Im a pf regular.A family member my sister messaged me and my husband and told me that they need my SOC to add us as a beneficiary to something. To be clear, I trust this person completely and dont believe they would try to do something to take advantage of me, at least not intentionally. I say something because I dont know exactly what it is they are trying to add me onto, but Im working to figure that out and will update the thread when I know.The point question is, assuming I trust this person, does it seem reasonable that I would need to provide this information? I worry not that this person is doing something malicious on purpose, but that its strange that I would be required to provide this information to them. For example, my husband just completed our 401k enrollment forms with Vanguard. We were able to list out beneficiaries. They only required a name and date of birth for the person and their relationship. My question is, how do I handle this? I realize this might cross over the lines into rrelationshipadvice, but Im hoping somebody can at least tell me if its reasonable or NOT reasonable to provide this information. Thank you!  <response>: The 401k through my employer its through Fidelity requires an SSN to list a beneficiary. 