It seems that Barnali is Jai's step mom and NAtwar his brother......I think Jai's father married this girl of young age and left his mom and the will also ins on the same lines..maybe according to the will all the property goes to the second wife......
I was on Barnali being Jai's old girlfriend and Natwar being his son b ut comeon..."how many unsuccessful relationships can Jai have in one serial"