Is it obligatory for the couple to keep the orphaned girl with them, despite her maternal grandmother's refusal and desire to have custody of the child?

The custody of a daughter belongs to her maternal grandmother, and the mother's right to custody is forfeited upon her marriage. However, if the grandmother agrees to the daughter staying with her mother, there is no harm. Efforts should be made to persuade the grandmother to relinquish her right to custody out of compassion and mercy for the daughter.