Minor is a family organizer and cannot remove him

Hi. I’m trying to add my son to my family however I get this error message “You'll need to leave your current family group to join a new one. To leave a group, select Go to family group, find your name, and then select and Leave family group.” When I logI into his account he is the only person on that account and he is the family organizer even though his age is set to 11 years old. Ive tried to edit his date of birth but it is greyed out because he is a minor. There is also no option to leave the family group. If I logon with my account I don’t see him there as a family member. How can I resolve this issue? Thanks Brett

:)