Can I have a Apple ID on my. Phone change it to my new Apple ID and keep all my apps and data?
iPhone 12 Pro
Only by changing your Apple ID email address to a new one as described in Change your Apple ID - Apple Support
Will this keep the previous Apple ID for my family’s phones
No -- the instructions in Change your Apple ID - Apple Support are about how to change the email that you use for an Apple ID to a new email without losing any purchases or other data. You then use that new Apple ID email instead of the old one.
Each family member should use their own Apple ID; sharing an Apple ID is usually not a good idea.
Can I have a Apple ID on my. Phone change it to my new Apple ID and keep all my apps and data
