Hi K.,
I have been doing daycare now for 4 years and since the start of this all my daycare parents refer to me as Mrs. W.. Now my daycare kids on the other hand I have 1 almost 3 yr old and I have watched her since she was 6 months old and from the time she started talking she has called me mom or mama. But I know and her mother knows that she knows who her mother is. I am just the one that helps her get to the potty, feeds her breakfast, lunch and 2 snacks a day and kisses her boo boo's when mommy is at work.
I have another daycare mother who was jealous of me and thought that I was trying to take her place, I reassured her that he does know who his mother is and does love her. In all actuality I don't know ho you would rather have a child act. I would be concerned as a mother if my child didn't love their provider. With all my daycare kids I have a very special bond with them. I am the "mommy" during the daytime while their mothers are at work. For me I look at my daycare kids as my kids, they are my kids. I take care of them everyday, love on them, discipline them when they need it. I love all my daycare kids as if they were my own. It makes me feel sad when they have to leave, I often feel heartbroken like someone took my own child.
I think you should just reassure your daycare parents that they do know who their mother is. And the only reason they do call you mom is because they here your kids call you that. I have 4 children of my own, 2 of which are here with me everyday and they call me mom, it is only fitting that everyone else would call me the same. My husband doesn't leave until 8:30 am and when my kids are here they call him dad and so do the daycare kids.
On another note I remember being a kid and my friends would come over to stay the night and my mom would introduce herself as Kaye but you can call me "mom" just like everyone else does.
I don't know that I gave you any advice really but I remember when I first started doing this and the 1st child I watched called me mom. I felt so horrible like I had done something wrong. And in actuality it just means you are doing exactly right. We are they mommies, we are the #2 mommies in our daycare kids lives. Hope this helps, W.