After valid adoption the relationship is same as that of with natural/biological parents.
Rest are facts and details of your matter that you may relate.
Hindu Adoption and Maintenance Act 1956
Section 10: The child must be less than 15 yrs of age. However, if a custom to the contrary exists, such an adoption may take place.
Section 12 : an adopted child is deemed to be a natural child of his adopted parents for all purposes. All relations with the natural parents and family are severed and new relationships with the adopted parents are established. …………………………………the adopted child is not divested of his property that has vested in him before adoption ...