וביום השמיני ימול בשר ערלתו

וביום השמיני ימול בשר ערלתו Riddle: ראובן was the בכור from both parents. Even though he was a perfectly healthy baby no Bris will be done on him because of מתו אחיו מחמת מילה. His two younger brothers died when they had their Bris. How is this possible?  Answer: ראובן is a triplet born Friday night בין השמשות. His two younger brothers were born on שבת proper. Reuvain's Bris gets postponed to Sunday while his two younger brothers have it done בזמנו on Shabbos.