Sheena and Indrani Bora - Half Siblings?

Indrani Bora was born into a middle class family in Guwahati, India. She had two children with Siddhartha who would go on to become her first husband. At just 18 she divorced him and moved to Kolkata where she married Sanjiv Kana. Indrani's parents went on to adopt and raise Sheena and Mikhail giving them their last name Bora. The police then tracked down Siddharthaas, the man who had come to Mumbai claiming to be Sheena's biological father,. looking for her in 2012.