this is a very messy situation and one of those things where everyone is right. here are some of my questions
1)i still fail to understand why karan had to marry to find a caretaker for bhoomi. after all there are other females in household,nanny services and lastly single parenthood.
2)if he married tanya becoz he did not know how long nandini will be under and his family wanted him to move on, then why the current confusion.
3)legally while tanya maynot be his wife but if she claims the 3 years nandini was under coma as seperation period(in india i think 1 yr is enough), then she will be considered as his legal wife and all ties between nadini and karan severed.
4)have they ever considered the amount of confusion this will add to bhoomi's mind about her parenthood. karan is her father(oops not her birth father , but his brother) and tanya is her mother(not birth mother but her very good friend).
5)personally while i do not blame nandini but she is trying to grab back all her rights without taking stock of situation. three years is a very long time to get over in a single day. she should try to go a bit slow.
6) true tanya took a big risk in marrying karan(she probably thought god was giving her heart's desire in a single shot) but why should we expect her to play martyr after she gave three years of her life to viranis. why should she have to slick away like a criminal when she did nothing wrong.
7)now about sleeping together....for god's sake tanya nad karan are married, do you expect them to spend thier entire life in celibacy while karan is pinning for nandini and tanya is wasting away in hopes of winning over karan.people move on, that is what happened with tanya and karan.
8)true karan loved nandini(he also loved damini at one time) but he moved on . if he takes nandini into consideration(who married his half brother in her mercurial bout, almost never trusted him, went into coma ,gave him his arch rival's daughter to bring up), he should also consider tanya(who married him for his daughter, who never pushed him in last three years and who stuck with him thru thick and thin).