Srimad Bhagavatam Canto 12, Chapter 05, Text 03

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.
Srimad Bhagavatam Canto 12, Chapter 05, Text 02
Srimad Bhagavatam Canto 12, Chapter 05, Text 04