So the Bible says you should love one sinner, but not two?
Let me ask you a question:
If your child is running as fast as they can towards what you know to be a sheer cliff with a 500 foot dropoff, would it be 'unloving' to try and stop them?
You're missing the point entirely. The real issue here is whether the daughter's girlfriend is hot.
"So the Bible says you should love one sinner, but not two?"
Somewhere along the line there is an endorsement or acceptance of the sin, which is not OK.
Just to take it out of the heated context, let's use premarital sex (pretty much the same verses in the Bible).
Son brings serious college girlfriend -- or even fiance --- home for Christmas. They want to sleep in the same bed. No brainer using the Bible to say "no." They're not married. Period. Paragraph.
Now son brings boyfriend home. They've even been "married" in MA. They want to sleep in the same bed. It's still a no brainer in the Bible to say "no." Whatever MA may say, the Bible is clear. That's not marriage.
Variations and iterations ensue, but it goes back to text alluded to in my tagline. After saving the adulteress from the rock-throwers, Jesus said, "Now, go and sin no more."
People forget that second part.
"The intractable issue seems to be if the kid wants to bring the "partner" home for the holidays."
sink: "So the Bible says you should love one sinner, but not two?"
So people opposed to homosexuality (especially those with religious convictions) should welcome relative's illicit sex partners into the house so they can perform their illicit sex acts right there?
Sink, you're unbelievable. In your world, in order to prove that one doesn't "hate" homosexuals, one must open his house to the practice of same sex acts.
Unbelievable.