If I want to adopt my cousin...what do I do?

I don't know where to look so if not here, maybe someone would be so kind to redirect me or something, I just don't know where to begin. My 1st cousin has a baby, the baby has little of what she needs & he is not equipped to parent. I'm told "he's not good with her", she has no bed, she is "treated badly" by my cousins girlfriend. I'm beside myself. No one will call CPS & I have no proof, i see them 2-3 times a year. The baby's mother is in prison for 5 yrs. I want to adopt her. BUT I want the parental rights cut. I don't want a small 6 yr old suddenly being taken away by her ex-con mother or my cousin with his issues popping in & out. And we MIGHT want to move out of state within the next year (we're in AZ with the rest of my family). We live modestly, we don't have a lot of spare money but I am a parent to a teen & grade schooler. Is this impossible? What do I do? How can I start?