Phaëthon's sisters, the Heliades, turned into poplars.
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Grieving their brother's dead they turned into poplars.
They were turned into hideous creatures who have snake for hair and can turn people into stone with their gaze.
Their names were Stheno, Medusa, and Euryale. And as a group they were the Gorgons.
Medusa and Poseidon were courting in Athena's temple and she turned Medusa and her sisters who helped her get into the temple the three Gorgons. ('cuz courting in her temple was hugely disrespectful)
Athena had no brothers or sisters.