Why are worldly relationships considered unreliable for spiritual progress compared to the Guru in this chapter?

Chapter 45 makes a clear distinction between the support offered by worldly relationships and the guidance provided by the Guru for achieving the ultimate spiritual goal. It states that while family members like a mother and father will show affection, a son will be focused on his inheritance, and a wife will mourn for her own status, none of them can be a true companion in the spiritual goal. The text argues that these relationships are transient and bound by worldly concerns. In contrast, the Sadguru is presented as the eternal and true Brahman, a solid mass of consciousness. Therefore, upon final reflection, only by renouncing reliance on others and meditating on the Guru can one achieve liberation.