Niobe, daughter of Tantalus: told her people to stop worshiping Leto and Apollo and Artemis, for Niobe thought herself and her children greater then those gods and goddesses. She was punished by her six sons and six daughters dying at the hands of Apollo and Artemis: some myths claim a daughter or/and son survived.
Tantalus did it to his son.
The daughter was Niobe
Niobe
Tantalus committed the crime of sacrilege by serving his son, Pelops, as a meal to the gods during a banquet. The gods were horrified by this act and punished Tantalus with eternal torment in the afterlife.
Favored by the gods, Tantalus was allowed to dine with them. Taking advantage of this postition, he either made a meal for the gods of his son Pelops or he told other mortals the secrets of the gods which he had learned at their table. When Tantalus served Pelops to the gods, all except Demeter recognized the food for what it was and refused to eat, but Demeter, grieving for her lost daughter, was distracted and ate the shoulder.
The element named after the daughter of Tantalus is niobium. It was originally known as "columbium" but was officially renamed to niobium in 1949 by the International Union of Pure and Applied Chemistry (IUPAC). The name change was made to avoid confusion with a similar element, tantalum, which is also named after Tantalus.
Tantalus was punished in Greek mythology for his crimes against the gods, including serving his own son to them as a meal. As punishment, he was condemned to eternal torment in the underworld, where he was surrounded by food and water that he could never reach.
Tantalus and Sisyphus are two characters from Greek mythology who were punished in the Underworld eternally. Tantalus was made to stand under a fruit tree and in a puddle of water, but could not eat or drink- the fruit avoided him, and the water receded. He had killed his son and tried to make the gods eat him. Sisyphus was punished by having to attempt to roll a rock uphill forever. He had betrayed Zeus to a river-god, as Zeus had kidnapped the river-god's daughter in the form of an eagle. Seeing this, Sisyphus told the river-god, incurring the wrath of Zeus upon him.
Niobē.
The identity of his wife is variously given: Dione; or Eurythemista, a daughter of the river-god Xanthus; or Euryanassa, daughter of Pactolus, another river-god, or Clytia, the child of Amphidamantes.
From Niobe - daughter of Tantalus, goddess of the tears in the Greek mythology.
The moral is that when you become to selfish, it affects more people than just you. After Tantalus died his evilness had been passed down to his daughter and then to her kids and their kids.