What are the astrological effects of Ketu in the 4th house

Ketu, the shadowy planet without a human form and visually inaccessible, exists as the tail of the Dragon, while its counterpart Rahu exists as dragon head. Ketu, the headless warrior, seems to be less lethal when compared to Rahu, that represents the brain of the Dragon. A native with Ketu in fourth house tends to be spiritual in outlook, a curious questioning mind.