In Greek mythology, Pandora’s jar was opened in the home of Epimetheus.
Epimetheus received Pandora even though his brother Prometheus had warned him not to accept gifts from Zeus. Pandora became his wife, and the container associated with her was opened after she entered his household. In the myth’s causal structure, Epimetheus’s lack of foresight helps bring Zeus’s punishment to humanity.
The story is often summarized as though Pandora alone caused the disaster. Hesiod’s narrative is more layered: Zeus orders her creation, the gods equip her with gifts, Epimetheus accepts her, and Pandora opens the container. Different retellings assign different motives to the opening, ranging from curiosity to divine compulsion.
Prometheus is an easy alternative answer because he is central to the story and warned Epimetheus. However, he is not Pandora’s husband or the owner of the household where the jar is opened.