Is it kosher for CC Cos. to contact a relative who is in no way connected to account (and, though not relevant, with whom you've had no contact for 15 years) ... simply because information on that person can be found in that company's (or an affiliated company's) database?
No, not listed as a reference. Just another member of the (dysfunctional) USAA family, which I (mistakenly, it seems) thought was run better.