What was sophocles relation to oedipus? (other than that he wrote the play "Oedipus the king")?

Personally I think that to a certain extent he identified with his character. Authors usually do. In Oedipus at Colonus, one of his last plays, Oedipus is an old man, betrayed by his sons, who reaches the city of Athens haunted by his past. His two daughters are his aids and the citizens of Athens agree to offer him shelter. When Sophokles wrote that tragedy, he was old. Athens had lost the civil war, and a new regime had been established. Sophokles in all his previous plays referred to the glory of the city. Iophon, his son, had tried to prove that Sophokles was senile in front of a court. Of course Sophokles won the trial but he was too old, disheartened and tired. His vision of his beloved city was that of a sanctuary for an old and once respected man. I suggest to read the play and a biography of Sophokles for more comparisons.