What are my rights as a step parent to take my child to places?

My wife and I have been married for a year and a half and together for two years. I have been financially responsible for both her and her daughter, my step daughter, for the greater portion of all of that time. Her biological father is out of the picture and not on her birth certificate and she knows no father but me and calls me daddy. I have power of attorney for my wife and "our" daughter, as we call her, is left to me in the case of my wife's incapacity. I pay for her medical bills, school, insurance, and everything else required for life, as my wife is a stay at home mom. We plan on moving out of her grandparents house this summer so we can establish our residence so I can adopt her. My wife is currently out of town and has left our daughter's well being to me. I wanted to visit my parents (a mere 20 miles away) who she calls grandma and grandpa because that's what she knows and who they are to her. My wife says, when I do things that she doesn't like or take her places that she doesn't like, like apparently like my parents house now, she will call the police. What rights does she have to restrict me when she's left to me, and what rights do I have to take my daughter to my parents house, much less anywhere?