I have a dilemma, which maybe isn't a dilemma at all, but a matter of preference or background.
Me and my brothers refer to our Mom as Mom, Mommy when we were very young. My Mom and my Uncle, referred to their Mom as Mother. And, as far as I remember, my dad referred to his mom as Mother, too. When I was a child, I didn't know of anyone who actually called their Mom Momma. In fact, it was considered kind of...well, ghetto. Or country, at least among my circle of friends, family and acquaintances. Now, don't throw rocks at me, that was just my narrow-minded thinking based upon my own personal experience growing up in small town Des Moines, Iowa.
The first person I knew who referred to their Mom as Momma was a young lady I dated in high school. She had moved to Des Moines from Kansas City, and pronounced the word 'Momma' ebonically, drawling a two syllable word into almost five, which solidified my ghetto-country perception of the word. Years later, Hallmark started producing black greeting cards, and they used lines like: Happy Birthday, Momma! And I thought that was somehow patronizing. Of course, I ended up moving to Texas, where I learned the word wasn't ghetto, country, or black. It was Texan that got spilled over onto the rest of the country.
Now, I referred to my Grandparents as Grandma and Grandpa. So, I was surprised to learn that some people — a mostly southern thing, I think — refer to their Grandma as Big Momma. Don't you know, my lips would be three times their physical size, and well calloused by now, had I ever referred to my Grandma as Big Momma.
Now, I'm not condemning anyone's right to call their Momma whatever they like. It's just that now that I'm writing for children, I got to thinking about all the ways we address our Mothers and the different connotations that can be derived therefrom.