Should Christians Coddle Sin? - Relatives Openly Sinning in Your Home

Your nephew wants to come over for Christmas dinner. . . only trouble is, he wants to come dressed up as a girl. An uncle wants to sleep over with his girlfriend or boyfriend in your house. . . but that's okay because he just brought 20 gifts for the kids, and he's quickly becoming their favorite uncle. How do Christians interact with the world without rendering approval for the sinful behavior going on? Christians give a pat answer, "You just gotta love everybody." But, what does this mean? The more difficult question is: "How do you love them?"