Herbert Weir Smyth, A Greek Grammar for Colleges

1. Not reflexive (his, her, its).

a. αὐτοῦ, αὐτῆς, αὐτοῦ in the predicate position (very common): ὁρῶ τὸν φίλον αὐτοῦ (αὐτῆς) I see his (her) friend, ““γιγνώσκων αὐτοῦ τὴν ἀνδρεία_ν” knowing his courage” P. Pr. 310d.

b. ἐκείνου, etc., or τούτου, etc. in the attributive position (very common): ὁρῶ τὸν ἐμὸν φίλον, οὐ τὸν ἐκείνου I see my friend, not his, ““ἀφικνοῦνται παρ᾽ Ἀριαῖον καὶ τὴν ἐκείνου στρατιά_ν” they come up with Ariaeus and his army” X. A. 2.2.8, ““παρεκάλεσέ τινας τῶν τούτου ἐπιτηδείων” he summoned some of his friends” L. 3.11.

c. ὅς, ἥ, ὅν, Hom. ἑός, ἑή, ἑόν (poetical): ““τὴν γῆμεν ἑὸν διὰ κάλλος” he married her because of her beauty” λ 282. Hom. has εὗ rarely for αὐτοῦ, αὐτῆς.

2. Reflexive (his own, her own).

a. ἑαυτοῦ, ἑαυτῆς, in the attributive position (very common): στέργει τὸν ἑαυτοῦ φίλον he loves his own friend, ο:ρᾷ τὴν ἑαυτῆς μητέρα she sees her own mother, ““τὴν ἑαυτοῦ ἀδελφὴν δίδωσι Σεύθῃ” he gives his own sister in marriage to Seuthes” T. 2.101, ““ὑβρίζει γυναῖκα τὴν ἑαυτοῦ” he misuses his own wife” And. 4.15. This is the only way in prose to express his own, her own.

b. ὅς (ἑός): poetical. Sometimes in Homer ὅς (ἑός) has the sense of own with no reference to the third person (1230 a).

c. ὃς αὐτοῦ, αὐτῆς (poetical): ὃν αὐτοῦ πατέρα (K 204).