Contact names showing up as my son's, not mine
Enthusiast - Level 2

This is a bit complicated.  I have a Galaxy S21 FE and all my contacts are synced to my Google account.  I have my teen's account also on my phone.  Even though I turned off syncing of contacts from his account, they still appear.  And Messages + is using the names from HIS account instead of mine- so for example, my husband shows up as "Dad," my Dad shows up as "Grandpa," etc.  Any idea how to tell it to use MY account's contact names?  Is the only way to remove his account and re-add it, making sure sync contacts is off from the beginning?