Looking for a small controller for kids

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My boys have been okay(ish) using a wired xbox360 controller but now their little sister wants to get stuck in and her hands aren't big enough to use the thumbsticks and the triggers at the same time.
I looked at the xbox 1 mini controller but according to the measurements on amazon the mini controller is the same size as the original xbox360 controller, so

Are there any fun sized controllers out there?

Thanks