Final answer:
Leda is not the mother of Castor, as in Greek mythology, Zeus fathered Helen and Pollux, while Castor was fathered by Tyndareus, Leda's husband.
Step-by-step explanation:
Leda is not the mother of Castor. According to Greek mythology, Leda was seduced by Zeus in the form of a swan, and from the union, two eggs were produced. One egg hatched Helen and Pollux (also known as Polydeuces), while the other hatched Castor and Clytemnestra. While Leda is indeed the mother of Helen and Pollux, who emerged from the same egg, Castor's father is actually Leda's husband, Tyndareus, making Castor Tyndareus' biological son and therefore not Leda's son by Zeus.