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Unfortunately, even though he was not legal at the time, you do not have to be a citizen to own property. Thus, by putting his name on the title means he can be considered owner of the house. If the house was purchased during marriage it is presumed to be marital property and it will have to be divided as part of the divorce and it is up to the two of you or the court if you cannot agree as to how the house is divided and who gets the house. However, he does have rights to a share of the house or to at least receive some monetary compensation to buy out his share of the house.
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