As Christians, we cannot embrace sin, not even in our own children. We love them, pray for them, hope they will see the error of their ways and show them tough love. You don't stop communicating but you can't love their sin. It truly is love the sinner and hate the sin. If one doesn't understand that, I'm not sure how much they read the Word of God. Jesus loves sinners; he hates sin.
I can't imagine disowning my own children.
As Christians, we need to look inward before we start casting stones. Breaking off communication even with your own flesh and blood does not a good Christian make.