When does become ?

morally and ethically anyone you are blood related to. the consideration should be made of the possibility of offspring from the relationship. congenital defects caused by inbreeding not to mention the social implications. There have been horrific effects on offspring of inbreeding( children conceived by related parents). mental illness, gross deformations and serious physical illnesses. The repercussions of and the possible consequences carry on for generations, no matter how far apart the inbreeding occurs. 2nd, 3rd, 4th whatever cousin. the laws of nature apply and repel horribly if ignored!!!