My study of charts of twins, even identical twins, show that there are few factors beyond a birthchart.
Certain KP followers have also tried to explain, and quite logicaly; but even then I have found that even identical twins quite often have similar destinies, but not same.
The are seen to have different birthnames, used names.
They also have a different physiognomy, and its known that Palmistry is a much used branch of ‘Sarirka Sastra’, used for guiding and also foretelling future like numerology and astrology is.
Then there are also other guides like I ching,tarot etc; but I have found the use of the above 3 accurate as precise foretelling tools