Sons custody battle for his daughter

Those of you who know me know that me or my family never ask friends or family for anything. But at this time We need some help. As some of you know my granddaughters mother passed away in May. My son currently has custody of his daughter and they live with us and she tells us she doesn't want to go back to her Aunts house she want to stay with her daddy. But her great Aunt who she calls mom mom has decided to take Dustin to court for custody because Willow and her mother lived with her. Neither Dustin or myself have the money for a first rate attorney who specializes in custody disputes. We have talked to one who is one of the tops in his field but he's not cheap ! This is where we're counting on our friends and family. Anything that you can do to help would be greatly appreciated !!! And please share