Proclus, Commentary on Plato's Cratylus 403 e (90, 28 Pasqu.) [= Orphic fr. 145 Kern; West 1983, p. 217; Kerényi 1976, p. 112. Demeter was usually said to be the daughter of Cronus and Rhea.
According to Hesiod, Theogony927–929, Hephaestus was produced by Hera alone, with no father, see Gantz, p. 74.
According to Hesiod, Theogony886–890, of Zeus's children by his seven wives, Athena was the first to be conceived, but the last to be born; Zeus impregnated Metis then swallowed her, later Zeus himself gave birth to Athena "from his head", see Gantz, pp. 51–52, 83–84.
According to Hesiod, Theogony183–200, Aphrodite was born from Uranus' severed genitals, see Gantz, pp. 99–100.