If a pair of male identical twins impregnate a pair of identical female twins, could the resulting offspring be considered siblings?
sounds like one of our conversations
http://www.reddit.com/r/AskReddit/comments/ftq4u/if_a_pair_of_male_identical_twins_impregnate_a/
sounds like one of our conversations
http://www.reddit.com/r/AskReddit/comments/ftq4u/if_a_pair_of_male_identical_twins_impregnate_a/