Custody Dispute: A Complex Case

Rahul's parents are divorced, and he lives with his mother, Neena. After the divorce, it was agreed that both parents would have joint custody of Rahul. However, recently, Neena has moved to Dubai for work and has been spending less time with Rahul. Her new husband, a UAE national, has applied for custody of Rahul in a Dubai court, citing that Neena is not fit to care for their son due to her busy schedule. Rahul's father, Ajit, is now worried about losing custody of his son. What legal remedy can Ajit apply for in this case under the Guardians and Wards Act, 1890?