Family sharing

You can create a new Apple ID for any in your group that wants/needs one.

Here is some thing you can do. 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 even though not changing an 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 the new ID. And, there are other issues to be addressed.

And see what Eric Root says on this matter here https://discussions.apple.com/thread/251343949 and

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

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You also can set up family sharing among 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

If you are all using the same Apple ID, there isn't a reason to set up Family Sharing. Since you are all using the same ID, you are already sharing everything that Family Sharing shares.