IPad apps showing up On my iPhone?

My sister just bought an iPad 2. And I linked her iPad to my account, because it's easier to activate that way. I'm wondering why all the apps she's downloading, are showing up On my iPhone 4S?

Take into account that I'm 16, and she's 9.

Your sister's iPad 2 is on your account, so her apps sync onto your iPhone. To stop this, create a new account for the iPad 2. Keep the accounts separate.

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