Remove permission for app
i gave a family member permission to have an app via family share plan. I would like to remove that decision so they no longer have access to the app but i can not figure out how to do It. Ive tried hiding the app on his appleid and mine, but if either of is searches for the app in the app store, the download cloud appears and he can download it again without having to ask for permission. Can anyone help me? Please save the "you should have been more familiar with the app before you said yes" for another day. Thanks.
iPhone 6