Hmm what do you think?

Latoya • Excited and nervous pg with my son and a mother of an 8 year old daughter

This was a question in a Fb group I am in would love to know your opinion:

So my daughters dad had a baby girl with another woman and the baby will be a year old and is starting to try to form word sounds. I know it's confusing for the baby because she is always there when I have residency of my daughter my question is. If to make it easier for the baby because she won't understand if my daughter should call her dads gf mom when she is there to make it easier. She has been in my daughters life since she was 2 1/2 and she turns 8 in less than a month. She knows I'm mom and would never want to hurt me but I don't want it to be confusing for the baby. We all get along really well there is no unsettled feelings or hatred at all I just want things easiest as possible. And my daughter knows I'm her real mom but I'm not her sisters mom. She understands all of that . Please if anyone has input I'm open to suggestions and opinions!