Shared Apple ID and pictures
How do I change my husband’s Apple ID from my Apple ID. Will all of his pictures go to his new Apple ID?
iPhone 6, 12
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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 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.
See How to switch Apple IDs on your iPhone or iPad
https://www.imore.com/how-change-apple-id-your-iphone-or-ipad
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 between the IDs to share purchases made with them on different devices. See:
Family Sharing https://support.apple.com/en-us/HT201060
Set up Family Sharing https://support.apple.com/en-us/HT201088