I'm gonna rant a little

My mom passed away almost 10 years ago and as much as I love my dad I have to admit he hasn't been the best parent ever. I know it's hard raising children alone, anyway that eventually led to me leaving when I was 16 and ever since I've felt so guilty for leaving my sister behind. She turned out to be rebellious and problematic so I decided to have her move in with me. That lasted a year before she moved back with my dad and now she's 16 and she's with me again. I've been begging my dad to give me limited or at least temporary guardianship of her just so I can enroll her in school and take her to her doctor appointments. It pisses me off so much that he isn't doing Anything to help me. I'm not asking for money all I'm asking is for him to go get the papers notarized I literally did all the paperwork for him already. I don't want to fight with him but I'm getting so frustrated I can't help being rude towards him.