SB 10.75.3
sri-badarayanir uvaca
pitamahasya te yajñe
rajasuye mahatmanah
bandhavah paricaryayam
tasyasan prema-bandhanah
Translation:
Sri Badarayani said: At the Rajasuya sacrifice of your saintly grandfather, his family members, bound by their love for him, engaged themselves in humble services on his behalf.
Purport:
King Yudhisthira did not force his relatives to accept different tasks at the sacrifice. Rather, out of their love for him they volunteered for such duties.