lifeisahighway, are u really going to read all this thread and decide what to do ? If you are, here is piece of my brain too.

In our culture, mama ra aama ko chori are same. So there is noway you could actually marry her. There are other culture that indulge is such thing, but it would not be acceptable in general. It will create a havoc in the family. People will try to hide from you. Your kid will have  a problem with other kids or vice versa.

Genetically as well, this practice is not recomended. The likely wood of the kid having genetic problem much higher in offspring produced by incest than diverted couple.

Listen to people, because u asked. Get away from her. Go far from her, you will be fine. Find someone else.