Your little sister is 4 at least now and is searching for something in the park.Then sche found something shinny and picked it up.She took it with her.
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A day later:
your mother says that you need to take the chlotes of your little sister and bring it in her room. You do so like your mother says. when you grab the chlotes and bring them the diamond falls. You pick it up and lay on the chlotes. when then an elecktrick jolt came to you. you then hurry up bringing the chlotes to your sisters room. Your sister came in and ask you"Do you have the Diamond". You say "Do you mean that thing here it hurts". "Ow you did it your own" and she came back with chlotes of you. she touched the diamont and the chlotes of you. and you noticed that she was growing and getting taller. But then you look on your own body that your shrinking. she was 12 now and you are now 14. now you came same age 12 and 12. but you didnt stop getting younger. And she also not. then you are 6 and she 16. there you notice your hair is now longer then shoulder lenght. and that it was getting blonde. it get itchy around your groin. you didnt know what was happening. but after another 5 minutes you were your sister and your sister is you.But the diamond vanished. "Now I am the bigger one"She/He says.
What do you do now