My daughters call me Kat, avoids the confusion of people thinking a name like Maddie is my first name. While, technically, I am their father, I never identified with being the father or male parent. Recently my youngest began saying that I was her other mommy. My ex was fine with that, and on mothers day, this year, they gave me a mothers day greeting. I was in PA about to have surgery, so we didn't celebrate in person, but she has allowed me to share the day with her. It feel more right to me, and I appreciate being recognized on that day as well. Just because I provided the sperm doesn't mean I have to be called a father.