"The eldest brother is the father and the eldest sister is the mother" means that the eldest son and elder brother in the family should help their parents take care of their siblings and be responsible for housework; When parents are not at home (going out, secular), the boss of the family should take the responsibility of parents, take good care of younger siblings and educate them. This sentence makes it clear that the eldest of the children has family responsibilities, so we should care about our younger brothers and sisters and help our parents pull this home. Being a father means being a brother is not only taking care of siblings, but also shouldering the responsibility of education and training. Siblings and big brothers are not only a kind of sibling affection, but also a little similar to the kind of parenting with parents. Respect for big brother is second only to respect for father, so there is a saying that "big brother is father".