The text seems to say that family isn't helpful for spiritual goals. Why is that?

Chapter 45 explains that worldly relationships, including those with close family, cannot be fully relied upon for achieving one's spiritual goal. The text points out that these relationships are based on worldly attachments and motivations. For example, a mother and father will show affection, a son will be focused on the wealth he can claim, and a wife will cry for her own status (vermillion). Because they are not companions in the spiritual goal, the chapter concludes that upon final reflection, only one's own self remains, and a seeker must have strong self-confidence rather than placing hope in others.