That their lives may turn out if they try to be happy and if they are protected by their uncle Creon summarizes what Oedipus says to his daughters in the monologue in "Oedipus Rex" by Sophocles (495 B.C.E. - 405 B.C.E.).
Specifically, disgraced Theban King Oedipus says that the Princesses Antigone and Ismene will be shunned and taunted for being both the daughters and half-sisters of their own father and both the daughters and granddaughters of their own mother. He states that their lives have the possibilities of being friendless, spouseless and childless because of their father killing their grandfather and marrying their grandmother. But at the same time, Oedipus suggests that their positive attitudes may make a difference, particularly if their uncle Creon, as Oedipus' brother-in-law and royal successor, becomes their guardian.