Complex Relations: MiMi vs RiMi(Rinki Mihir)

What is the problem if Mihir marry Rinki?

Mihir is such a nice gentleman. Mihika's truth will affect Mihir. but he will defintly love Rinki ONLY. He may prepare Mihika for another marriage.

Rinki is not biological sis of Mihir. so whats the prblm? he is like raman's brother, but not real one. Shagun is mom of Raman's kids. If Mihir is his brother, then Shagun is Raman's sister??? Then ok.. I wil agree Rinki is mihir's sister.

In THIS SENSE the relation with Mihika, there is also a 'RELATION' prblm.
Mihika: Ishita's sister
Ruhi or Ishra's baby :Ishita's baby...

so for ruhi/ishra's baby::
Mihika is Siththi (younger sister of mother)
Mihir is the brother of mother

Now relation betw Mihika and Mihir is also Bro-Sis

Even according to medical terms...