How old is your nephew? If he has never had a credit card before, tell him to go to capital one and apply for a capital one platinum mastercard. That's the first card I ever got approved for without having a day of credit history.

A good option is also getting an unsecured card from his local bank like Bank of America.

My sister is thinking that she should get my nephew his own credit card, so that he can purchase anything that he wants with it. He has asked me on this matter, but I don’t have any idea on this, so I’m writing this thread to search for a good answer.