This is the public request page required by Google Play. In the app, go to Family, tap your profile, then Remove account.
Removing your account deletes your sign-in now. If other adults remain in the family, diary content you added stays for them as Former member (no name, email or photo). If you are the last adult, the whole family is removed.
We permanently erase hidden copies within 90 days. You can sign up again immediately with the same email — that creates a new family.