There exists already very early in the Greek tradition the concept of a proverbially cruel stepmother. By the time of Hesiod, the stepmother (μητρυιὴ) has distilled, essentially, into a single word formula for cruelty. In the conclusion of Works & Days (822-28):
Αἵδε μὲν ἡμέραι εἰσὶν ἐπιχθονίοις μέγ' ὄνειαρ·The juxtaposition of the mother (μήτηρ) establishes a polar relationship, i.e, cruel : caring. But this minor contextualization is unnecessary for Aeschylus in the 5th century (PB 725-27):
ὄρνιθας κρίνων καὶ ὑπερβασίας ἀλεείνων.
Some days are a great benefits to men on earth,
But others are indifferent, harmless, bringing nothing at all.
Someone praises one kind of day, but few understand them.
Sometimes a day is a stepmother, sometimes a mother.
He is fortunate and blessed of men, who
knowing all these things, works on, guiltless in eyes of the gods,
discerning omens of flight and avoiding transgressions.
A pan-Indo-European theme? Even broader? I need to do some more investigating.