[Request] How To Disable Child-inappropriate Ads

Hi, my 6 year old LOVES PVZ, PVZ2, and PVZ Heroes. We had to delete PVZ2 when we realized it was routinely showing him ads with content that is completely inappropriate for his age. Now I am seeing the same thing with PVZ Heroes. Is there any way to turn off the ads, even via a paid version? He has diagnosed conditions affecting his impulse control so unfortunately just telling him not to follow the steps in the game that lead to ads is not an option - it just leads to him trying to hide the screen from us when the ads are playing so we won’t take it away, because he can’t resist the desire to earn in-game currency/lives/whatever it’s offering. Please help, is there any way to make it so he can keep playing PVZ2 and/or PVZ Heroes without the exposure to ads? I’ve already gone through Apple support since we use Apple devices and they have informed me that there’s nothing they can do about the fact that adult ads show on even games that are rated ages 4+ or 9+ ☹️ thanks.