I would start off talking about how Jesus emphasized loving one another at John 13:34, 35. Then, I would bring out that even though Paul says to treat ones not faithful as "a man of the nations," that Jesus sat and ate with the tax collectors and never shunned anyone.
Research actually shows that treating one as a man of the nations, or gentile, is not cutting off all contact, but merely not worshipping with that person.
Next, I would quote 1 Timothy 5:8 "Certainly if anyone does not provide for those who are his own, and especially for those who are members of his household, he has disowned the faith and is worse than a person without faith."
This shows that cutting off family is actually unscriptural.
After that, I would mention 2 Thessalonians 3:13-15
"13 For YOUR part, brothers, do not give up in doing right. 14 But if anyone is not obedient to our word through this letter, keep this one marked, stop associating with him, that he may become ashamed. 15 And yet do not be considering him as an enemy, but continue admonishing him as a brother."
I would then tie it together as to how the WTBTS practice of modern day shunning is not supported in the Bible and they do not practice the love Jesus taught about.
I think I would sum it up by quoting Matthew 25:34 - 40:
*** Rbi8 Matthew 25:34-40 ***
34 “Then the king will say to those on his right, ‘Come, YOU who have been blessed by my Father, inherit the kingdom prepared for YOU from the founding of the world. 35 For I became hungry and YOU gave me something to eat; I got thirsty and YOU gave me something to drink. I was a stranger and YOU received me hospitably; 36 naked, and YOU clothed me. I fell sick and YOU looked after me. I was in prison and YOU came to me.’ 37 Then the righteous ones will answer him with the words, ‘Lord, when did we see you hungry and feed you, or thirsty, and give you something to drink? 38 When did we see you a stranger and receive you hospitably, or naked, and clothe you? 39 When did we see you sick or in prison and go to you?’ 40 And in reply the king will say to them, ‘Truly I say to YOU, To the extent that YOU did it to one of the least of these my brothers, YOU did it to me.’
After a brief pause, I would then just exit the stage.
If God's Spirit is filling a Kingdom Hall, how is it that Satan can manuever the ones within that Kingdom Hall at the same time?