It's difficult to say for sure which god has the most demigod children, as Greek mythology doesn't provide definitive numbers. However, Zeus, the king of the gods, is often considered to have the most children, both divine and demigod.
Zeus's reputation for being a prolific lover is well-documented in Greek mythology. He fathered many children with both goddesses and mortal women. Some of his most famous demigod children include Hercules, Perseus, and Helen of Troy.
While other gods like Poseidon and Apollo are also known for having many children, Zeus's status as the king of the gods and his frequent liaisons with mortals likely contributed to a larger number of demigod offspring.
It's important to note that Greek mythology is full of inconsistencies and variations in different accounts. Therefore, determining an exact number of demigod children for any god is not possible.