What is the ruling on one who swore an oath of تحريم (prohibition) upon his wife with the intention of bringing her back home, but was then unable to fulfill this oath?

The wife's family has no right to impose conditions for her return. If the husband swore to prohibit his wife if he returned to his former actions with her, the ruling depends on his intention: if he intended zihar, then it is zihar; if he intended divorce, then it is divorce; and if he intended an oath, then it is an oath. If the condition is met (his return to what he was doing previously), then what he intended occurs; otherwise, there is nothing upon him.