With only two children, the "pressure" brought about on the children after their parents are retired is less than if there was only one child, or none.
目前有成年子女的父母多不是目前生育子女的父母，都擁有二個以上的兒子，則於老年退休時對子女家庭所帶來的「壓力」就少於只有一個或甚至沒有兒子的父母，尤其是在政府拒絕所得移轉（由稅收等公共收入補貼老年支出）的條件下。