<prompt> Human: My mother just informed me that my grandfather asked her for my daughters social security number because he wants to open up an account. My grandfather has had a shady financial record and I honestly dont trust him. He has been dishonest in the past with family affairs. A big red flag is that when his wife dies probably soon he will be kicked out of her house. I dont know, but I assume he doesnt have a ton of extra money to spare.My gut tells me to tell him no. I was wondering if there is anything harmful he could do with this information. My wife and I are the only ones who know her SSN and dont plan on sharing. Am I crazy?Assistant: Also thought it was strange that he would ask my mother and not myself.  <response>: I want to add that not only put a lock down on new credit with the bureaus, but put any papers that have your kids SSN on it in a lock box. Birth certificate, SSN card, etc. Just in case the grandfather is somehow left unsupervised in your home in the future. I would also do the same with your and your wifes SSNs just in case. 