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Mars is the ruler of Ketu's adversary, the eighth house. If Ketu is benefic in the eighth house, the native will have a son when he is 34 years old, or after his sister or daughter marries. If Jupiter or Mars are not in the 6th or 12th house, Ketu does not produce malefic results. The Moon has a similar influence when it is in the second house.
The native's wife will be sick if Ketu is malefic in the eighth house. It's possible that the son will not be born or will die before he reaches adulthood. The native may have diabetes or a urinary problem. The native will have bad luck if Saturn or Mars are in the seventh house. In the event of malefic Ketu in the 8th house, the native's character influences his or her health.