My contacts will not sync to iCloud. In fact, my son's account is syncing with iCloud even though it is my account.

My contacts will not sync to iCloud. Yes, I have the same userID/email and time zone. I select "merge" contacts on phone, pulled down on groups to update and even backed up my phone to iCloud.

My son's contacts and nicknames are in the account, which is very strange since he does not use my iCloud. He is in my family sharing group.