I am 15 years old. Several years ago my mom remarried to a man who has treated me like his biological kid even after he and my mom had more kids. I want to have his last name, but my bio-dad refuses to give my dad parental rights or let me have his last name. i want to know if there's anything I can do on my own to change the situation. My bio-dad has never provided for me at all, even before my mom remarried. My biological parents separated before my mom even knew she was pregnant, so I've never lived with my father as my dad. The only real dad I knew before my step-dad was my grandfather who passed away a few years ago.