Is there a sin or guilt upon me if my wife returns to visit my mother's house after I swore to divorce her if she went there again, due to her frequent complaints?

The oath of divorce cannot be cancelled or dissolved according to the majority of scholars, because it is a conditional divorce that takes effect upon the occurrence of the condition. Some scholars differentiate between whether the one who swore intended to make the divorce conditional, in which case it takes effect upon the occurrence of the condition, or if he only intended it as an oath, in which case it is considered an oath for which expiation (kaffarat yamin) is due. The preponderant view is that of the majority of scholars. Therefore, if the wife goes to the husband's mother, the divorce will occur.