It is my opinion that anyone on your blacklist should not be able to enter your house, or be able to enter a fc house if the fc master blacklisted them.

But making the above happen might mean changing a lot of the backend of how blacklisting works, so it might not be possible right now.

I suppose alternatively SE could make a house specific blacklist which denies entry to those on it. But I don't know if this would be easier or harder than expanding what the current blacklist does.

Anyway OP I'm sorry that this is happening to you. I hope that grifer gets bored soon and you'll be left alone.