I have looked into Hera and her children, besides Typhon and Prometheus (I've never come across the Prometheus bit
- but I have seen Hephaestus as Hera's son alone, what's your obscure source Alejandro?)
There is Hera's care of the Kharites, and one in particular Pasithea, is mentioned to have Dionysus as a father and Hera as a mother. Her gives her to Hypnos to marry.
Nonnus, Dionysiaca:
"[In the war of Dionysos against the Indians:] While the Indians were running drunken on the hills, just then sweet Hypnos (Sleep) plying his vigorous wing, assaulted the wavering eyes of the persistent Indians, and put them to bed, tormented in mind by immoderate wine, doing grace to Pasithea's father, Dionysos."
Nonnus, Dionysiaca 31. 103 ff :
"[Hera commands Iris summon the god of sleep Hypnos:] ‘Promise him Pasithea for his bride, and let him do my need from desire of her beauty. I need not tell you that one lovesick will do anything for hope.’
At these words, Iris goldenwing flew away peering through the air . . . seeking the wandering track of vagrant Hypnos (Sleep). She found him on the slopes of nuptial Orkhomenos (Orchomenus) [i.e. the home of the Kharites]; for there he delayed again and trailed his distracted foot, a frequent visitor at the door of his beloved Pasithea . . . [Iris disguised as Nyx, Hypnos' mother, spoke to the god:] ‘I have heard that you want one of the Kharites (Charites, Graces); then if you have in your heart an itch for her bedchamber, have a care! Do not provoke Pasithea's mother, Hera the handmaid of wedded love!’"
Also there is this:
Ptolemy Hephaestion, New History Book 7 :
"Those who dive from the top of the rock [of Leukade on the island of Leukos in Western Greece] were, it is said, freed from their love and for this reason: after the death of Adonis, Aphrodite, it is said, wandered around searching for this. She found it in Argos, a town of Kypros, in the sanctuary of Apollon Erithios and ‘l'emporta’ after having told Apollon in confidence the secret of her love for Adonis. And Apollon brought her to the rock of Leukade and ordered her to throw herself from the top of the rock; she did so and was freed from her love. When she sought the reason of this, Apollon told her, it is said, in his capacity as a soothsayer, he knew that Zeus, always enamoured of Hera, had sat on this rock and been delivered from his love."