Good Character Comes From The Parents

Numayr ibn Aws {May Allah be pleased with him} reported: I heard my father say that they used to say:

'Correct action is a gift from Allah, but Adab/Good Character comes from the parents."

الصَّلاَحُ مِنَ اللهِ، وَالأَدَبُ مِنَ الآبَاءِ

{Source: Imam Bukhari's al-Adab al-Mufrad}