Using others credit cards

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Is it ok to use other peoples credit cards, with the owners consent of course? Ok so here's my problem. Im going shopping and and I don't want to carry loads of cash with me so I asked my dad if he could just let me borrow his credit card. It was fine for him to let me use it but now our problem is he's not really sure if its even allowed to lend your credit card. So is it ok for me to use my dad's card with his consent or would i get asked for ID and such when i use it? or worst would i be accused of identity theft?!