Atreus' grandfather Tantalus cursed his family for serving his son Pelops to the gods. Pelops was brought back to life and married Hippodamia through divine help
Tantalus cursed his family by serving dismembered Pelops' remains to the gods. Pelops became king after killing Myrtillus for interfering with his marriage. Myrtillus' curse spread to Pelops' descendants through his death