Hi pgleason83,
We'd love to see if we can help. What we would recommend is correcting the birthdates on their current accounts. As the family organizer, that would be the only way to remove them. Once that is completed, you can then remove the accounts. Note: If the account is set up for a child under 13, you will need to contact Apple Support via the link included in the information below.
"Edit your birth date
If you need to change the birth date for someone below age 13, contact Apple Support.*
On the web
- Sign in to appleid.apple.com.
- Select Personal Information, then choose Birthday.
- Update your birth date and click Save.
Depending on how you created your Apple ID, you might be required to provide additional information or change your Apple ID username from a mobile phone number to an email address.
On your iPhone or iPad
- Go to Settings, then tap your name.
- Tap Personal Information. You might need to enter your Apple ID password.
- Tap Change Birthday or Birthday.
- Update your birth date, then tap Done.
Change a birth date for a child
To change a birth date to any age below 13,* you must be a member of a Family Sharing group, and your family organizer must approve the change. After you change a birth date to any age below 13, you can't edit it.*
- Update the birth date.
- Follow the onscreen steps to send an email request to your family organizer.
- Your family organizer will get an email with instructions to approve the request.
Learn more about Family Sharing.
*Age requirements vary by country or region. If you need to change the birth date for a child, contact Apple Support."
Reference: Update the birth date associated with your Apple ID - Apple Support
Cheers!
