I also answer to Mama, Mommy, Ma, Lady that gave birth to me, and a few others. What I do NOT answer to is Daddy. Yea, try telling the 20 month old that. He refuses to call me mom. It is always "daddy, daddy" oh and today, he even called me Nana.
So this is what I would like to say to Arin:

"I carried you for 41 weeks and 3 days, I delivered your little punk butt with no epidural, I breastfed you exclusively for the first 8 months of your life and then continued on until you were 14 months old. I am home with you all day long. I kiss the bad ow’s and boo-boos. I change your butt. I tuck you in at night and say your prayers with you. I could go on and on. But look child, all I am asking is for a little consideration. Just a tad. I know that you a capable of saying Mommy. You have let it slip every now and then and if we tell you to say mommy or momma, you will. But why is it that every time you look at me, you call me Daddy? I just wanted to let you know that while I love you to bits and bits, I'd like a little of that in return. I'd like to walk in the door and you look up and yell, ‘Mommy's home!’ When I pick you up over the baby gate, how about a ‘thanks Mom’ instead of ‘thanks Daddy.’ Could you do that for me please? Thanks a bunch.”

*Now don't get me wrong, Daddy is a great guy and he helps out a ton around here. I just want my baby to call me by my name, not his.