The son is only a source of joy to his father. The father is all in all to a son. The body and all else that the son has he has got from the father alone.
प्रीतिमात्रं पितुः पुत्रः सर्वं पुत्रस्य वै पिता। शरीरादीनि देयानि पिता त्वेकः प्रयच्छति॥