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

Chapter 45 posits that worldly relationships, including those with a mother, father, son, or wife, are ultimately not dependable for achieving one's spiritual goal. The text suggests their motivations are often tied to worldly concerns; for instance, a son may be focused on inheritance and a wife on her own status. These relationships cannot be fully relied upon for spiritual help. In contrast, the Guru is presented as the one who can facilitate spiritual attainment. After final reflection, the text concludes that only one's own self, guided by the Sadguru who is the true Brahman, remains as the constant means to achieve the ultimate spiritual goal.