The only relatives who can travel for the same cost as the employee or retiree - it's free only after certain level of seniority is attained - are spouses, parents and children under 24 years of age. Everyone else has to use a "buddy pass." The current "buddy pass" allotment is 16 one way trips per year for active employees. I believe, but am not certain, that retirees get only 8 one way D3 passes per calendar year.