Remember sharad said in d seg that rishi will come 2 know about tanuja being tanu , coz something happen during accident time but nothing such happen during accident time , now tanuja is donating her blood 2 save rishi , thou she wants her name 2 be kept hidden but i dont think it will be kept hidden. I think may feel dizzy , so nurse may reveal that she saved rishi , smily's truth is also coming out , it will make big impact on family , specially rishi. Kratika said in iv that family will know that tanuja dont had any bad intentions 4 family nor she is interested in their property but she is only interested in rishi that to positivly.
From here rishi will start seeing tanuja & tanu as same , plus bani is making reentry so after some days sandy tanuja truth will also come out.rishi will see in tanuja tanu's qualities
1) she saved rishi
2) her selfless she took blame 4 smily & family
3) after going through so much humiliation, still she forgave rishi.