"YOU must take control of the topics for conversation, which must center on the person and work of the Lord Jesus Christ. Everything else is an exercise in futility as you could be engaged in a life-long conversation about nonsense.
"
That's really the bottom line. If they are on your property, I see no reason why one must be held captive by nonsense. Start by saying, "I'm glad you're here! Have I got good news for YOU!"

Stand Fast, Craigellachie!