Switch family
How do I join another’s family sharing
iPhone 12 Pro Max, iOS 14
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Leave your current family group and then get invited to join the other one sat outlined in the second document:
Leave Family Sharing - Apple Support --> https://support.apple.com/HT201081
Set up Family Sharing - Apple Support --> https://support.apple.com/HT201088
https://support.apple.com/HT201088
"Remember, you can only join one family at a time, and you can only switch to a different family group once per year." June 2021
https://www.apple.com/legal/internet-services/itunes/us/terms.html
D. "Family Sharing Rules: You can only belong to one Family at a time, and may join any Family no more than twice per year. You can change the Apple ID you associate with a Family no more than once every 90 days. All Family members must share the same Home Country."
I still haven't figured out if those say the same thing. :-)