Well, I'm not defending Jesus's viewpoint here, but am just presenting it as an internal criticism of mainstream Christianity. The logic of Jesus's opposition to both riches and biological families is clear: both are liable to be worldly attachments that distract from our all-important relationship to God. This is just a Romanized Jewish version of the Axial Age mysticism that flourished especially in India's religions of renunciation, and which made its way to the Mediterranean via Greek philosophy (Cynicism and Stoicism).