养儿代老，积谷防饥

Explanation: Means to prevent the elderly dependent care son, save grain to prepare for famine. Old age with raising children, a rainy day. " Thesaurus:  (of parents) to bring up cihldren for the purpose of being looked after in old age Rainy day, Raising a child to be old for a rainy day, Son Old age for a rainy day