LoveUniHateExams,
[Kunti is the name of Arjun's mother. He is often addressed as Son of Kunit]
You can use google search engine for reincarnation proof..
You don't need proof. It is based on Galatians 6:7, our own experience and reason, and also science (every action has equal and opposite reaction). If one could not reap in this birth, it will happen in any of the future births.