Look man… Greek mythology was the attempt to join several villages with their own religions and pagan gods in a gigantic crossover fanfic in order to form a empire. All the titans, gods, demi-gods and deities had their own histories, then they were all sewn togheter into a conplex family tree so all the villages could still workship their different gods and all still be part of the same religion.

But all the religion canon was such a gigantic mess that the villages (which were set miles apart from one another) formed their own different headcanon of the lore. This is why saying that there was a truly accurate version of greek mythology is a lie. Even today different nations teach different versions of the legends in their schools

It's best not to think about Greek familial relationships. You end up with A LOT of incest.