Children are basically seen from the 5th house in the horoscope. All details of children are 5th house, 5th lord and the planets that are connected with them. Some school of thought suggest that only first child should be seen from the 5th house and the second child is seen from the 7th house. Jupiter is the kakra for Son and therefore its placement and strength is most important for happiness from Son. Jupiter and the 5th lord should be well placed. The 5th house conjoined with or aspected by benefics. The presence of malefic in the 5th house and weak 5th lord will harm progeny.