Drona
द्रोण
Dronacharya is the son of Bharadvaja, the martial-guru of both sides of the Mahabharata; father of Ashvatthama. SB 1.7.45: 'sa esha bhagavan dronah praja-rupena vartate' — he exists as the Lord in the form of the subjects.
Śrīmad Bhāgavata Mahāpurāṇa 1.7.14 — Sanskrit Wikisource (pinned oldid=110178)
Drona is the father of Ashvatthama. Source evidence (SB 1.7.14): Ashvatthama is Drona's son: 'drauni' (SB 1.7.14). Evidence: EXPLICIT (patronymic).
Husband Kripi HumanDrona is the husband of Kripi. Source evidence (SB 1.7.45): Kripi is Drona's wife: 'tasyatmano 'rdham patnyah... kripi' (SB 1.7.45), and 'asya janani gautami' (SB 1.7.47) — Ashvatthama's mother. Evidence: EXPLICIT.
Teacher Arjuna KingDrona is the teacher of Arjuna. Source evidence (SB 1.7.44): Arjuna learned the Dhanurveda from Drona: 'sarahasyo dhanurvedah... bhavata shikshito yad-anugrahat' (SB 1.7.44). Direction: pupil -> teacher. Evidence: EXPLICIT.