Wait. Does Leo have foresight because her sperm donor is from the south?

No, only those from the ruler of the south's family (Duke of South) has the ability of foresight. North is Fang, East is Mana, West is Aura, and South is Foresight. The Duke of South (Old lady in chap 175 mentioned this too. Leo's sperm donor is from the south but from a different family.