While on a DL coded flight, wife listed as S3 and non-dependent son S3B. Active Skywest empl listed in seniority order along with DL emps. RS buddy listed near the bottom of the stby list. When later flights were listed as RS, RS employee still listed in seniority order with DL emps, but now the RS buddy was moved up to just below active RS employee..but above non-dependent son. Is this correct?