I've heard of twins of different color because the lab didn't properly clean the tubes and accidentally mixed two different sperm. It was many years ago and there were legal problems. It was so long ago and I forgot if who wanted the child now but the others didn't...... Also, there was another twin case where a woman had sex with her boyfriend. Then she was raped by her ex after he broke down the door and raped her like the next day. The twins had different fathers. I think her rapist ex then sued for custody or some crazy shit like that. Didn't get custody I don't think.