Mommy, Momma, Mom....who will it be

So we had a discussion the other day about who will be called what. Will one of us be Momma and the other Mommy and which one of us will be who. At first we thought maybe we let the kid decide.....you know how kids are, they'll call you whatever they want to. But that would make it hard while they are not able to speak. So we're in a dilema on this one. I think Tonya should be momma because Samantha calls her that on occasion. I guess we could go with Mum and Mom....bring in some of our English roots? Naaah.....that's just too proper. So we're still undecided. It will probably be one of those things that just naturally happens? What do you guys think?