What to do if a family member needs to pay you back for something they broke?

My aunts son ( my cousin) broke my iPad by accident, stepped on it and cracked half the screen. My cousin admitted to cracking the screen. The next day I tried using my iPad and it started moving stuff by itself like clicking on apps. I asked my aunt to pay for it but she denies it. She says my little sister is the one who broke it and Is just blaming it on her son, which is not true. She just likes to get away with things and is so cheap. What should I do? It is her son, her responsibility. Half the screen is cracked but the bigger problem is that it does weird stuff when in the home page

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