I think you're making mountains out of molehills, when it's all said and done you're the mother she's the grandmother, but If it really bothers you you need to say something to your mother , let her I know that it hurts your feelings and maybe if you're lucky in the process you won't hurt hers.
MOMS: How would you feel if your mom told your child that she is his "grandMOMMY"? Also, how would you feel if she constantly called your child "My sweet baby [boy/girl]"?
Oh my!!
For all of my granddaughter’s life I’ve said she was my sweet baby girl. And she is!! Her mother knows she’s her mother but she is my special girl. You are making too much out of this.
Be glad your mother loves your child. So many children have no love in their life!
I guess the reason that it bothers me so much is that my mother and I have a very strained relationship, and she has made it clear on more than one occasion that she doesn't care anything about *our* relationship, that it is ALL about her and my son only in her eyes, she absolutely refuses to acknowledge my partner as his other parent (I'm in a 10 year same sex committed relationship and we have actually been married since 2012). I carried our son and now we have an almost one month old that I also birthed and my mom barely acknowledges him, but she acts so completely obsessed with my 3 year old it's disgusting. My grandma has referred to my son as "my boy" and that doesn't bug me....Because she doesn't act like my mom does. And I haven't even scratched the surface here!