Leda facts for kids
Zeus charmed her as a swan, and Leda laid two eggs. Out of one egg came Helen and Polydeukes, who were the children of Zeus. Out of othe other egg came Klytaimnestra and Kastor (see Castor and Pollux) who were the children of Leda's husband Tyndareos.
Leda Facts for Kids. Kiddle Encyclopedia.