Apple ID

Adding to what I said above.

See How to create a new Apple ID https://support.apple.com/en-us/HT204316 See the data implications below.

Some of these things will apply to your situation even if you are not changing your Apple ID: What to do after you change your Apple ID or password https://support.apple.com/en-us/HT204071

 Keep in mind that some things available under a first Apple ID will not be available under a new Apple ID. For example, you won’t be able to transfer anything purchased from the App and iTunes Stores to a new ID. And, there are other issues to be addressed. See

what Eric Root say on this matter here:  https://discussions.apple.com/thread/251263630

what Winston Churchill says about it here: https://discussions.apple.com/thread/7452747

__________

You also can set up family sharing between the IDs to share purchases made with them. See:

Family Sharing  https://support.apple.com/en-us/HT201060

Set up Family Sharing https://support.apple.com/en-us/HT201088

Create a new separate Apple ID for use on each household device. See How to create a new Apple ID https://support.apple.com/en-us/HT204316

You can't have a master account with multiple Apple IDs assigned to it. Each device can have its own ID and be separate from each other or they can use the same Apple ID and be on the same account.