This paper re-envisions the personhood of severely disabled children, who are often excluded from the category of human beings in the academic literature due to their perceived lack of mental faculties, based on Japanese philosopher Watsuji Tetsuro's concept of human beings ("ningen"). It begins with Carl Elliott's claim that personhood should be used as a thick ethical concept. This concept has two features. First, it represents a fusion of fact (describing someone as a person) and value (taking an ethical attitude toward a person). Second, it is embedded in our rich and culturally specific forms of life. This paper suggests that Watsuji's concept of "ningen" also has these features. Watsuji criticizes how Western ethicists take individual consciousness or will as their starting point for determining personhood. Instead, he argues that neither a subject nor a community exists as an entity in itself, but that the relationality between them ("aidagara") is essential to their identity and that our communication is embedded within rich and social contexts. Through his etymological study of Japanese word "ari," Watsuji points out that in making statements, one both discloses the world and becomes aware of the attitude one should take toward other beings. Some commentators, such as Sakabe Megumi, have suggested that such self-awareness entails the transformation of our sense of relationality. This paper leverages Watsuji's concept of "ningen" to re-envision the relationship between caregivers and severely disabled children as relationality-based and therefore open to complex and rich communication.