Under Section 20 of the Hindu Adoptions and Maintenance Act, 1956, a Hindu is bound to maintain:

Section 20 includes legitimate children, illegitimate children, and aged or infirm parents among the persons a Hindu is bound to maintain. All listed classes therefore fall within the provision. The duty remains subject to its qualifications: children ordinarily claim while minors, while an unmarried daughter and aged or infirm parents unable to maintain themselves have the further protection in subsection (3).