I Personally believe that incest is gross and wrong morally. but if the people contributing to the incest/relationship are grown enough (25 or older) to know morally what they are doing then i think we shouldn't care. yes we will all have are own personal options but when do we not? incest is "forbidden love" and love should never be "forbidden".
Honestly I don't really care what other people do with their personal lives and neither should anyone else so fuck you. As for partaking in incest, if I had a distant cousin and she was an 11/10 I believe I would take at least a blow job.