My nephews father died when he was 18 months old, now he is eight and his mother died today. How do I let the court know I would like to raise him?

Father killed himself, mother died of meth overdose last night. I am an RN with a BSN and 1 year away from Masters degree. Husband has a BSN and we have two girls 16 and 12 1/2. I have a 4 bed room house in East Cobb and financially able to care for him without state funds. Of all the family, I am the most stable and educated to care for this child