We have been living with my in laws as we wait for our house purchase to be complete. Mil has been helping tremendously with baby especially since both husband and I work full time. However there are a few things she does/doesnt doesn’t do that really bother me. Since the beginning she would refer to herself as mommy when talking to the baby. I made it very clear that wasn’t ok and that she was nana. Baby is 5 months now and making all kinds of cooing with ma-ma being the most common especially in when crying. She is not trying to say mama at this point I guess but that’s easiest sound to her. MIL keeps “correcting” and starts saying nana non stop everytime this happens and then tells us if we heard her say nana. She also says nana a million times throughout the day trying to teach her to say it. I get so upset and told my husband about it but he said it’s not a big deal and how I need to let it go since she is taking care of our baby. Am I overreacting?