I’m sorry you feel unhappy with what another one of your Daddy’s partners is calling him. Polyamory is not immune to jealousy, envy, misunderstandings, or other common relationship problems. Though, I read this and it does appear that your Daddy
is, indeed, also her Daddy too:
Jeni wrote: ↑1 year ago
… but is her caregiver …
A Daddy is a Caregiver. The “Caregiver” title is just a gender-neutral version of things like Daddy or Mommy. Caregivers are the same thing as Mommies and Daddies. You can think of it almost like pronouns in that Daddy, Mommy, and Caregiver is very much like he/him, she/her, and they/them. The they/them is gender-neutral but still a person! It doesn’t make them another species, right?
If you and your Daddy agreed that his other partners wouldn’t call him “Daddy” then letting this Little call him “Dadda” certainly seems like he’s skirting the agreement through the tiniest loophole. Maybe this is all a misunderstanding of sorts though and it’s something he didn’t realize means (and certainly sounds like out loud) the same thing to you. Miscommunication and misunderstandings just happen!
You should talk to him and tell him that when you agreed to “Daddy” being reserved to you that it meant other ways of saying “Daddy” too. Don’t forget to give him some examples of what names his other partners could call him that you would be comfortable with so he can consider those and talk it over with his other partner. You might have to compromise or adapt in some way after discussing this but you should definitely speak up to him and let him know what exactly is bothering you and how it could be fixed. I’m sure you’ll find a solution together once you talk it out.