The Tomb of Hygeia, Untouched by Marriage and Offspring

IG V,1 726 Lakonia and Messenia (IG V,1) : Lakonike (From the PHI Website)

“I am the tomb of a mother’s daughter and son–
They were allotted a swift passage to Hades.

The first of them used to be called Aleksanôr among the boys,
But the girl, Hygeia, died before marriage.

The Muse graced her young son with education;
and jealous Hades robbed her away as he grew.

So the mother has two children, but now she weeps
Three times as much for one untouched of mate and offspring.”

μητρὸς καὶ θυγατρὸς παιδός τ’ ἔτι τύμβος ὅδ̣’ εἰμί,
οἳ λάχον ὠκίστην ἀτραπὸν εἰς Ἀΐδην.

ὧν ὁ μὲν ἐν κούροισιν Ἀλεξάνωρ ἐκαλεῖτο,
ἡ δ’ Ὑγίεια, γάμου πρόσθεν ἀποφθιμένη·

ἄρρενι δ’ ἠϊθέῳ παιδείην ὤπασε Μοῦσα,
ἣν Ἀΐδης φθονερὸς νόσφισεν α̣ὐξομένου.

καὶ μήτηρ μὲν ἔχει παῖδας δύο, τρισσὰ δὲ πένθη
νῦν κλαίει γαμέτης ἄμμιγα καὶ γενέτη̣[ς].

Here’s what the inscription looks like in before being split up into couplets. I am pretty unsure about the third couplet.
1 μητρὸς καὶ θυγατρὸς παιδός τ’ ἔτι τύμβος ὅδ̣’ εἰμί, ❦ οἳ λάχον ὠκίστην ἀτραπὸν εἰς Ἀΐδην. ❦ ὧν ὁ μὲν ἐν κούρο<ι>-σιν Ἀλεξάνωρ ἐκαλεῖτο, ❦ ἡ δ’ Ὑγίεια, γάμου πρόσθεν ἀποφθιμένη· ❦ ἄρρενι δ’ ἠϊθέῳ παιδείην ὤπασε Μοῦσα, ❦ ἣν Ἀΐδης φθονερὸς νόσφισεν α̣ὐξομένου. ❦ καὶ μήτηρ μὲν ἔχει παῖδας δύο, τρισσὰ δὲ πένθη ❦ νῦν κλαίει γαμέτης ἄμμιγα καὶ γενέτη̣[ς].