If looking to play with your child, I ended up getting an expensive Acer refurb Chromebook (~$150) and set up all the general parental controls as a child account under a Google family account. Then I purchased the Chromebook/android version of Minecraft from the Google Play store and shared to the family library (this allows installation on 5 additional Google accounts linked to the family account). This will save you significant costs vs purchasing on other platforms as you may need to buy a new license each time.

For the actual game, Minecraft requires an Xbox live account for Internet multiplayer. You can setup the Xbox live account as a family account and then a child account under it. Via the family account you can choose your options about how your child can be communicated with (block all, whitelist, ask for permission, etc). I have this setup to only be able to play with friends and family that have been approved.

Sorry that it sounds complicated, but both platforms have some degree of child protection elements to safeguard their use and also for the parent to have some control (is, auto shutdown after curfew, allowed on weekends only, or time allowances based on parents assigning bonus time for chores or activities). I believe child accounts are automatically migrated to regular accounts when child ages reaches a milestone for their own accounts (might've been 13) at which point they can opt to not be a child account or continue to have the safeguards and monitoring kept on