Not saying its right.... we dont choose who we fall in love with but yes with most of the rest of us it is with someone outside of our immediate family. The human race is strange though...
Agree that its not good and not right when your talking about bringing children into it. With the potential risks it certainly is not fair on the baby and I think a selfish thing to do.
These two are having a surrogate child, its getting too complicated for one thing.