My parents always called each other by their first names. Now they would say stuff to us like "go tell your dad that dinner is ready," but when talking to each other they used their given names. My mom once explained it to me by saying well I'm not his mom, why would he call me that? That made so much sence. I knew when I had kids I wanted to do it the same way. I told Jeff that under no circumstances is he to call me "Mom." My in-laws laughed and said don't be so sure, you might change your mind, but I brushed them off.