boyfriends daughter calling me momma

My boyfriend and I have been together for over a year now and his daughter calls me momma. I have a good relationship with his baby momma and he as a civil one with her boyfriend. We also found out that she calls her moms boyfriend dad. I think it's awesome because she has so many wonderful people that love her. I was just wondering if any one has a similar situation or if your step daughter/son calls you mom?