Zeus has 5 relationships.These are Metis,Themis,Eurynome,Mnemosyne and Hera.These women's children are;
1.Metis-Athena
2.Themis-Horas and Moiras
3.Eurynome-Kharits
4.Mnemosyne-Musas
5.Hera-Hebe,Ilithya,Ares and Hephaistos.
FOOTNOTE:Although Hera's jealousness,Zeus has lots of relationships with goddesses and transitories.
One of them is Io and she has one child,Epaphos.
Second woman is Europa and her children are Minos and Rhadamanthys.
Another lover is Leda and her children are Polydeukes and Helena.
Finally sweetheart is Danae and her child is Perseus.
The final question's answer is absolutely Athena!