First of all, your cousin is a selfish person. He doesn't care about your feelings, he just wants to be happy for a while. This may be a habit of his parents, but there are many such girls now. Moreover, it is not good to ask you for help when you are powerless. On the contrary, instead of asking you for help, you rely on the help of nature. But I can see that the relationship between your is still good. As a sister, she is older than you, so naturally you can't say anything. You can tell her directly, cousin, that I have run out of money and I need to buy something. Can you support me? See how she answers you at this time.

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... good luck. . . . .