Child custody of us citizen child born to indian parents

Hi Sir / Madam, I am a Father (Indian Citizen) of US citizen child (5 years old boy child) and Mother ( Indian Citizen - living in Canada as NRI). We have a child custody case going on in High court. Child was living with mother before ( Till she was in India) and currently child is with Father for summer holidays for a month. Child's maternal grandparents filed a case for custody of the child till mothers reunion with child in Canada. Could you please let me know what are my chances that I will get custody of my child as I am in India with child now.