Hello MichaelLStroupe,
It sounds like you want to remove someone from your group chat. We know how important this is for you, and you’re in the right place for answers. This may help answer your questions:
If you can't add or remove someone in a group message
• You can only remove someone if the group has four or more people, and everyone is using an Apple device, like an iPhone or iPad.
• You can only add someone to a group message if they're using an Apple device. If you want to add someone to a group message but they're using a non-Apple device, you need to create a new group message. That message will use SMS/MMS by default since someone is using a non-Apple device.
• You can only add someone to a group message that already includes three or more people. You can't add someone to a messages conversation that you're already having with just one other person.
This info is located in this support article: Add and remove people in group text messages on your iPhone or iPad - Apple Support
If you were unable to remove them from your group chat, then you will need to create a new group chat.
Farewell.