Why does this text suggest that worldly relationships like family can't help with spiritual goals?

According to Chapter 45, worldly relationships are considered unreliable for achieving spiritual goals because their foundations are tied to material and emotional concerns rather than spiritual liberation. The text posits that those who do not help in worldly life are unlikely to help in spiritual pursuits. It gives specific examples, noting that a son will be focused on the wealth he can inherit, a wife will cry for her own status (vermillion), and a mother and father's affection is not the same as spiritual companionship. Ultimately, it concludes that no one is a true companion for the spiritual goal, and one must rely on one's own self.