9th house is influenced by Jupiter. If the native has good relation with ones brothers and sisters it is fruitful; else it would adversely affect the native. If the native is not religious minded then his progeny would be useless for him. Professions influenced by Saturn would be profitable. If Jupiter is in 5th or 11th house then it is useless. If Rahu is inauspicious in 9th house then chances of begetting a son are less, specially if native files court cases against one.s blood relation. Rahu is in 9th and 1st house is empty thenhealth could be adversely affected and one gets insulted and mental problems, specially from olders.