Vaishnava Dharmashastra 32.1

32.1

rājartvikśrotriyādharmapratiṣedhyupādhyāyapitṛvyamātāmahamātulaśvaśurajyeṣṭhabhrātṛsaṃbandhinaś cācāryavat ||

A king, a priest, a learned Brâhmana, one who stops wicked proceedings, an Upâdhyâya, a paternal uncle, a maternal grandfather, a maternal uncle, a father-in-law, an eldest brother, and the parents-in-law of a son or a daughter are equal to a teacher;