James speaks of the believers as if they are biological brothers. The term here includes women as well as men. AT: "fellow believers" (See: [[rc://en/ta/man/translate/figs-metonymy]] and [[rc://en/ta/man/translate/figs-gendernotations]])
This is a rhetorical question James uses to scold his audience. This can be expressed as a statement. AT: "You are just a human and cannot judge another human." (See: [[rc://en/ta/man/translate/figs-rquestion]])