As far as I know, there were 4. They are Dionysus, Heracles (Hercules), Apollo, and Artemis.
Depending on the account you read, Athena was either Hera's step-daughter or her sister, and although in the step-daughter account, Hera was very angry at Zeus for having a child without her, the anger was directed at Zeus (or in some accounts his mistress), and not at Athena herself.
Hera is also the aunt of Artemis, as Hera is both wife and sister to Zeus. The mother of Artemis is Leto who either did not marry Zeus (which may be a bias of a monogamous interpreter) or was a co-wife along with Hera.
Where in myths Metis is the mother of Athena, Hera wife of Zeus would then be her "step-mother".
Since her father was Zeus, there are many step - brothers and step - sisters of Athena. She didn't have any real siblings, though.
Horus was one of the big gods and (supposedly) so was Anubis. Really they are both (step) brothers so they must be on the same level of power. (In a cool way...Anubis is cooler then Horus or that's my opinion)
Betty White has three step-children, two step daughters and a step son.
Betty White has three step-children, two step daughters and a step son.
Betty White has three step-children, two step daughters and a step son.
She has no step kids
He has 2 children and 2 step children
He has 2 children and 2 step children
Artemis is the daughter of Zeus: Hera is the wife of Zeus, and was married to Zeus at the time of Artemis' birth - so, yes, Hera is the step-mother of Artemis.
Depending on the account you read, Athena was either Hera's step-daughter or her sister, and although in the step-daughter account, Hera was very angry at Zeus for having a child without her, the anger was directed at Zeus (or in some accounts his mistress), and not at Athena herself.
Hera is also the aunt of Artemis, as Hera is both wife and sister to Zeus. The mother of Artemis is Leto who either did not marry Zeus (which may be a bias of a monogamous interpreter) or was a co-wife along with Hera.
What percentage of children in the UK live within a step-family
3 and two step children !!
If you are talking about Athena the greek goddess, then she was a step-sister. Zeus is pretty much the father of all the gods in greek history (of course there are some that aren't his children). Most of his kids were products of his genes and Hera's genes. But Zeus had a wife prior to that and her name was Metis. She was suspected to bear powerful children that would overthrow Zeus and being the power hungry leech he was, he decided to eat her. Gods are immortal and Zues wanted to keep her in his stomach so that she could give him advice, so while playing a shape-shifting game she was turned into a fly and Zeus ate her. But Metis was already pregnant with Athena so athena was born out of Zeus' skull and had one parent in common with the other gods therefore she is a step sister.