Twin Secret

http://paninformation.blogspot.com/2014/07/rajgir.html

Twin Mothers From Kashi 

http://en.wikipedia.org/wiki/Jarasandha

https://www.youtube.com/results?search_query=Jarasandha

Twin Daughters Married to Mathura

Two People Having Two Mothers 

http://charitybrave.blogspot.com/2013/12/karna-vs-krishna-vs-kunti-similarity.html

Having Twin Relationship

http://charitybrave.blogspot.com/2014/08/relationship-with-krishna.html

Knew How to Kill Him
http://charitybrave.blogspot.com/2012/01/jarasandha.html
http://paninformation.blogspot.com/2014/07/lord-krishna-blesses-liberated-kings.html