Removal of credit card details will result in cancellation of your subscription. Be mindful of this as Microsoft DOES NOT have to refund you the unused balance. You CAN request/demand a refund in the form of token codes which can be used in place of any
active credit card. It will however drop your son's current subcription from Silver/Gold to 'free' for which you can use the tokens to re-activate the subscription for the length of time the codes provide for.
As far as the credit card billing history and the 'last four digits' -- that information will forever be visible in your account.
Going forward, use MS POINTS/SUBSCRIPTION CARDS to purchase subscriptions/content in lieu of credit cards and auto renewal.
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