Just a comment. A few minutes ago, the trader who rents a part of my house decided to emply a couple to attend the shop, and they may also spend the nights in the shop. As they are not from my city (where there is no Jew) but from another province, I asked them to show me their genealogy to asure they are both Goyim. (Fortunately they are in fact both Gentiles). I don't allow any Jew who intermarried to stay in any land of my property, neither a Jew who breaks Shabat, even if the house is rented to a third party. What do you think of that?