Brothers and sisters, one refers to the zodiac chicken. Because brothers and sisters, a large number of people, a family, crowded together, happy. Squeezing is homophonic with chicken, so brothers and sisters refer to the zodiac chicken.
Zodiac Chicken is one of the 12 zodiac animals, ranking 10th, and the twelve earthly branches belong to "youshi", so the "youshi" in the twelve hours of a day-from 5 pm to 7 pm, is also called "rooster time".