If Ketu is in the 4th house, the person will have a disturbed relationship with his mother, who may herself be weak, sickly, or lacking in confidence. The person will be of a discriminating nature and bent on discovering the truths of life. He will have trouble obtaining land and homes, and may live in old houses with bugs, insects, and vermin. He may leave his parents early in life and live far from his birthplace. There will be car problems, which may be difficult to properly diagnose. Also, the person may have difficulties in his education or in obtaining a degree. The spiritual Ketu in this angular moksha house gives a strong interest inenlightenment or spiritual life.

UCHCHA (exalted). If Ketu is in Gemini or Virgo in the 4th house (or stationary direct or in forward motion), the person will own special homes, which may be used for out-of-the-ordinary purposes. He will drive fine cars and have a good education. The person's mother will be a beneficial influence and of great character. She may be highly spiritual.

Source: «Ancient Hindu Astrology for the Modern Western Astrologer» by James Braha