WHAT IN KUNDALI INDICATE A PERSON WILL HAVE CHILDREN
The answer to the question is as per KP vedic astrology padhatti / system.
The 5th house in a horoscope signifies children and so the 5th cuspal sublord if signifying 2nd, 5th and 11th house will indicate a person having children.
Wait wait wait this is just the first part in identifying birth of a child.
In astrology there are many small small parameters that has to be woven together to get the final prediction.
One need to study if the cuspal sublord is not placed in barren sign and the 5th house itself is not a barren sign. It is because the barren sign has power to deny a child birth.
The time of delivery of an event is seen from the ruling of mahadasha. So a child delivery is only possible if the mahadasha on that period is also supporting the same event.
If mahadasha is not supporting then child delivery will not happen during its ruling period.
One need to study and see if the 5th cuspal sublord is not cuspal sublord of 4th, 8th and 12th house. If so then it will give rise to problems.
According to dasha pravesh padhatti one need to study the mahadasha and its antardasha planet, if it is supporting the event in that ruling period of mahadasha planet.
In studying a horoscope, one need to study both the horoscope of the boy and the girl to arrive at more accurate prediction as it is the event between the 2 persons.
It is not a single sign that will indicate of children in a horoscope.
It is cumulative of many parameters that give rise to one single prediction.