I'm writing about this again because I just think watching it develop is interesting and I don't want to forget this.
I wrote about what S started out calling us here when she started transitioning towards a different name. That time it didn't last long.
But around Christmas, she switched over to pretty much always using Mom and Dad for the two of us, while using Mommy and Daddy for her bio parents.
Except when she's mad at me or I don't respond quickly enough to the first call for attention. Then she calls me Ms FirstName. :)