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When I added my adult children to my Discover IT card I requested they don't bother sending cards, it's for reporting only. I added one of them to my Capital One card and when it arrived I cut it up.
Yeah, sure, if you are just helping them with their report and score, why give them the card. I have a two friends, two sisters, a niece, and my fiance on my credit cards. God forbid I give my sister the SM card which has an $11K limit, since she can't handle that kind of temptation! (It was exactly that temptation that caused her last of three bankruptcies.)