I have no doubt that he who has got a son gains heaven. The three Vedas, which are the roots of the Puranas and which authoritative even to the celestials, contain many proofs of this.
यदपत्यं महाप्राज्ञ तत्र मे नास्ति संशयः। एषा त्रयीपुराणानां देवतानां च शाश्वती॥