He made divorce conditional upon something that his wife does not know about
Question

                My aunt’s husband swore that his wife will be considered divorced if she comes to our home. She does not know about this, and she came to our home for womb relation and reconciliation reasons. We do not know exactly when he swore that she does not go to our home.  By the way, my father, may Allah guide him, swears always by talaaq, and my mother does not have except one more talaaq to be haram for him. So what is the ruling on this? Also to be honest they are always fighting, every time they fight it just destroys our life more and more.
Praise be to Allah.
    In the answer to question no.
    82400 we have stated the ruing on 
    conditional divorce and discussed the scholarly points of view on the matter 
    in detail. There is also a warning against hastening to divorce or using 
    divorce as an oath.  

    Your aunt should understand that it is not essential that she 
    know about her divorce being conditional upon her doing something, and it is 
    not essential that she hear her husband utter the divorce, but her husband 
    should have told her what he had done. Not telling her what he said about 
    her divorce being conditional upon her entering her sister’s house shows 
    that he did not intend to stop her, rather he intended that the divorce 
    should take place. If he had wanted to stop her, he would have made sure she 
    heard what he said or he would have told her afterwards. 

    Whatever the case, it seems that he intended that the divorce 
    should take place, and she became divorced when she entered her sister’s 
    house, even if she did not know what he had said. 

    See also the answer to question no.
    43481. 

    And Allaah knows best.