Which might be the most approachable answer - purchase subscriptions to minecraft servers for your kids. However I would be reluctant to purchase anything that was not officially blessed - and would assume I could run a minecraft server for my own kids anyway ...
By the way, I personally want to puke when my kids play Minion Rush and I see three minutes taken up by thirty seconds running and 2.5 mins of sweeping through "buy buy buy" pages. Fucking disgusting.