In Lal Kitab, planetary placements in one house often cast a direct aspect or influence on other areas of life. Dr. Sharma reveals a tragic side-effect of Ketu in the 4th house.
While the 4th house rules the mother and home, Ketu's presence here creates a ripple effect that damages the happiness derived from children (which is naturally associated with Ketu's karakatva and the 5th house).
Dr. Sharma warns that a person with Ketu in the 4th will experience a rollercoaster of emotions ("kabhi khushi kabhi gami"). But their deepest, hidden pain will be related to their childrenβwhether it is difficulty in having children, distance from them, or sorrow caused by them ("aulad sukh ki kuch na kuch kami hogi").