I think it will be Bijoy's idea

Accoding to the segments Ishwari will write half property to sona's name. I think it will be bijoy who will ask her to give some proof that she has accepted sona and sona's fututre is safe in dixit house (i know he is not behind money or property). what better way for ish to make him understand than writing property to sona. I dont understand abt the prenup agreement though. what could be the need to it. Ish knows that dev cannot live without sona so i doubt she will again want sona out of his life anytime. Ofcourse Her insecurities will surface again but the story is abt sona and dev helping her overcome it. Cvs have set high morals for the show where even engagement is consideted as sealing of relationship. BOth the times when one lead was getting engaged with somebody else, othet lead was shown thinking that he/she is loosing thier love forever. This show is not like other shows where leads get married, divorced,remarried and stuff like that. So i dont think once they are married there is any scope for separation of any sort again. Coz if they separate (which i believe will not happen again) then there is no chance of return again. I dont get the infertility track also. Hope Dev stands with sona this time. Maybe this track will make sona and bose family to completely trust Dev again. Becoz as things have taken place they might agree for marriage but bose family will definitely have some doubts abt Dev standing for sona. In this track if Dev stands like a rock with Sona i think his character will be completely redeemed. Pls share your views.