Saptamsa (D7) Varga Chart is one of the sixteen main vargas (divisions of a sign) described by Parasara Maharshi. Parasara states that relationship with children, sex, genital organs and sex of child, children is to be judged from the saptamsa occupied by planets.
Every varga chart have certain purpose to read detailed level. Saptamsa not only about children, it’s mainly about 5th house. It also indicates relationship, sex, happiness, children, mostly the pleasure from the things like children, relationship we can predict.
In the above video I explained how easily we can read and understand varga chart. One basic and simple rule is D7 ascendant lord must not be placed in 6,8,12 houses, Karaka for 5rd house is Jupiter. He should be stronger then relationship etc. matters will be good. You need to consider current dasha and 5rd house lord of D1 & D7 how placed verify it then we can judge properly.