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Open Question: I feel horrible, did they both want me to go with no money?

my dad gave me $20 and my mom doesn't know. But a few minutes ago my mom just gave me $20 ( for the same reason my dad did). I'm going out with friends cause in NY there is no school till monday. We're going to the city. Should I give someone their money back, or just keep it and use it so they do not get mad? I appreciate them giving me the $ though, because I didn't ask and they just gave it to me, they didn't have too. But I just feel horrible for spending so much at the same time, when its not my money. Should I just use it since they gave it to me? ( My sisters did get the same amount of $ for school clothes( youngest sister) and my sisters accessories ( my other sister.. for earrings necklaces headbands etc..)for school ( since she goes to a school with a uniform but can wear jewelry) and i didn't go school shopping yet...