When asked if I have a bathroom in my house: See Below
I understand asking if you can use a person's bathroom as a guest in their home, or where is your bathroom that I can use as a guest in a person's home. But if you ask me if I have a bathroom in my home as a guest I say no and hand them a dried corn cob and tell them to head to the forest behind my home, and to use dried leaves if they need more toilet paper. And see below: