Poseidon his brother because he wanted to be the king of the gods and take his place because he lived in the water and hades his other brother because he lived in the underworld and that means hell and he wants to be out of there and be the king of the gods
There is no WHY about the gods. They have their duties, and that's that.
Zeus
no, several were mortals
Gods (any) do not justify their decisions to mortals.
There are plenty of mortals that Zeus killed, but he did not kill any gods or goddesses.
Zeus, the king of the gods in Greek mythology, liked being worshipped and respected by mortals, as well as maintaining order in the world. He disliked being defied or challenged by other gods or mortals, especially when it threatened his authority or power.
Zeus was the god of the sky, clouds, and rain.
His wife was Hera. He also was mythologized to have had many dalliances with other gods, as well as mortals.
Zeus's weaknesses include being easily swayed by his emotions, especially when it comes to relationships with mortals, and his tendency to act impulsively which can lead to conflicts with other gods or beings. Additionally, Zeus can be duplicitous and manipulative in his dealings with both gods and mortals, which can sometimes backfire on him.
Zeus's weaknesses include his arrogance and impulsiveness. He can also be manipulated by other gods or mortals who seek to undermine his authority or power. Additionally, his relationships and interactions with other gods and mortals can sometimes lead to conflicts that exploit his vulnerabilities.
It was only for the gods
Zeus was not a strict god, he allowed many things, but he didn't allow for other gods to have children with mortals because he did not want to get overthrown by a demi-god.