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There's no App Store on my iPad? How do I restore it?
Pretty sure it's impossible to delete it. He might have activated the parental lock which would cause it to be hidden, or he might have put it away in a folder.
Do a Spotlight search for the App Store. If he knows your restrictions passcode (if applicable), he could have remove the App Store from view. You can also select to restore all settings.
You could try doing a hard reset of your iPad. If the icon has been hidden, it will reappear after the reset. Hold both your home & power button at the same time until you see the logo.