SB 12.5.3
na bhavisyasi bhutva tvam
putra-pautradi-rupavan
bijankura-vad dehader
vyatirikto yathanalah
Translation:
You will not take birth again in the form of your sons and grandsons, like a sprout taking birth from a seed and then generating a new seed. Rather, you are entirely distinct from the material body and its paraphernalia, in the same way that fire is distinct from its fuel.
Purport:
Sometimes one dreams of being reborn as the son of one’s son, in the hope of perpetually remaining in the same material family. As stated in the sruti-mantra, pita putrena pitrman yoni-yonau: “A father has a father in his son, because he may take birth as his own grandson.” The purpose of Srimad-Bhagavatam is spiritual liberation and not the foolish prolonging of the illusion of bodily identification. That is clearly stated in this verse.