Amazon support family sharing for the same home address - 2 adults and 4 children I think can share the same Prime

My wife and I used to share 1 account, but then I wanted to buy her a gift that had to be a surprise - so had to create a new account and add it as part of the family to the original one…. Then kids grew up and wanted to make small orders themselves, and I didn’t want them to see our order history…

She should not. You should create an Amazon family and enroll her as a member.

This way Amazon can keep track of your separate buyer profiles.