Under which provision of The Hindu Marriage Act, 1955, a father or mother can apply for the custody of…

Section 26 of the Hindu Marriage Act, 1955 empowers the court, in any proceeding under the Act, to pass interim orders and make provisions in the decree for the custody, maintenance and education of minor children, consistently with their wishes wherever possible. So the answer is "Section 26". Section 23 deals with decrees in proceedings, Section 28 with appeals and Section 28A with enforcement of decrees and orders.