Cheng Yi assesses the case of Diwu Lun
viewing the brother's son as one's own
pp. 355-366
in: Xinzhong Yao (ed), Reconceptualizing Confucian philosophy in the 21st century, Berlin, Springer, 2017Abstract
The "Five Relationships' 五倫 (wu lun), namely those between ruler and minister, father and son, husband and wife, older and younger sibling, and elder friend and younger friend, provide the core interpersonal structures upon which Confucian philosophers have constructed a great deal of their social ethics.