Here are two Slokas, describing the descendants of Bharata. "O Dushyanta, the mother is but a sheath of flesh (within which the son dwells). The son sprung from the father is the father himself. Therefore, cherish your son. Do not insult Shakuntala.
अत्रानुवंशश्लोकौ भवतःभस्त्रा माता पितुः पुत्रो येन जातः स एव सः। भरस्व पुत्रं दुष्यन्त मावमंस्थाः शकुन्तलाम्॥