Isn’t this obvious from the inheritance of non-genetic factors? I would assume that twins would care more about their adopted children then their niblings. Probably correctly; unless you think that your values are overwhelmingly heritable, children you raise personnally are going to better represent your values than genetically close children raised by someone else
Isn’t this obvious from the inheritance of non-genetic factors? I would assume that twins would care more about their adopted children then their niblings. Probably correctly; unless you think that your values are overwhelmingly heritable, children you raise personnally are going to better represent your values than genetically close children raised by someone else