Estelle Blofis is the daughter of Paul Blofis and Sally Jackson and the younger half-sister of Percy Jackson.

The Trials of Apollo

The Hidden Oracle

Percy mentioned his unborn half-sister to Apollo, saying that he would like to meet her.

Percy Jackson, Estelle's half-brother.

Magnus Chase and the Gods of Asgard

The Ship of the Dead

While training with Magnus Chase in Boston, Percy mentions that he has to go back to New York and babysit his newborn baby sister. This is when her name is revealed.


Estelle is a female name originating from the southern region of France and surrounding countries known as Occitania.


  • Estelle is named after her maternal grandmother.
  • As Sally Jackson has Clear Sight, the ability to see through the Mist, it is possible that Estelle will inherit this ability as well.
  • Given that Sally was seven months pregnant in The Hidden Oracle, which takes place in January, Estelle was probably born in or around March.
  • it’s possible Estelle may be seen in later stories.
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