Dear Oklahoma,
I'm sorry things at your grandma's are not optimal but what you failed to mention is how you initially came to live with your grandma and if she is a legally court appointed guardian. Because you did not reference your mom at all, I am going to proceed at though she is not in the picture. I practice law in Illinois, so your state's rule may vary a bit from the information I'll be sharing from Article 11 of IL's Probate Code.
If you have a living parent who is willing and able to care for you, his (in this case) whereabouts are known, his parental rights have not been terminated (voluntarily or involuntarily) and he has not caused or contributed to your being neglected or abused, then he has a presumption (albeit rebuttable) to custody of you. So if your grandma doesn't have legal court appointed custody, you can live with your dad if he wants to exercise his rights. Even if your grandma has legal custody but your dad never relinquished his parental rights, he can still exercise his right of custody.
Minors who are 14 years of age or more-so you qualify-may nominate someone to be the guardian of his/her person and estate if a guardian is needed. FYI: Guardian of the person deals with your day to day living and guardian of the estate deals with your money. Oklahoma, you're at an age where you have some input. You can find more information at the Clerk's Office in your local circuit court on how and where to file any sort of nomination.
Before you run off to the court house or to call your dad, I do however encourage you to attempt to have an open and honest dialogue with your grandma about what her reasons are for the refusal of your request and also be honest with yourself about your reasons for wanting to move to your dad's. Best wishes with everything and I hope the info was helpful.
Answered on Oct 17th, 2012 at 3:36 PM