If you are willing to share, how does your family go about this issue? This is all hypothetical or theoretical for most of us. You actually live it.
We don't really have any rules about it. I usually get called mama or mommy when the kids speak to me and when they talk about me it's Mama Megan. They do mostly the same with Cyd, Macy, and Amy but the older kids sometimes just call Amy by her name and she's okay with this. I don't think it would bother me much if anyone called me Megan. It would be weird but I'd be okay with it if it ever happened. I do notice it changes over time what the kids say like they used to be more formal with the Mama Megan, Mama Cydne, Mama Macy stuff and then it just got shorter.
Steve is always dad to the boys and daddy to the girls.