Below is a selection of paragraphs from the WT 4/15/88 – Discipline That Can Yield Peaceable Fruit. This article outlines the 'administrative' directives in case there is any confusion.
Why is such a firm stand appropriate even today? Well, reflect on the severe cutting off mandated in God's Law to Israel. In various serious matters, willful violators were executed. (Leviticus 20:10; Numbers 15:30, 31) When that happened, others, even relatives, could no longer speak with the dead lawbreaker. (Leviticus 19:1-4; Deuteronomy 13:1-5; 17:1-7) Though loyal Israelites back then were normal humans with emotions like ours, they knew that God is just and loving and that his Law protected their moral and spiritual cleanness. So they could accept that his arrangement to cut off wrongdoers was fundamentally a good and right thing.—Job 34:10-12.
We can be just as sure that God's arrangement that Christians refuse to fellowship with someone who has been expelled for unrepentant sin is a wise protection for us. "Clear away the old leaven, that you may be a new lump, according as you are free from ferment." (1 Corinthians 5:7) By also avoiding persons who have deliberately disassociated themselves, Christians are protected from possible critical, unappreciative, or even apostate views.
— Hebrews 12:15, 16.
The situation is different if the disfellowshipped or disassociated one is a relative living outside the immediate family circle and home. It might be possible to have almost no contact at all with the relative. Even if there were some family matters requiring contact, this certainly would be kept to a minimum, in line with the divine principle: "Quit mixing in company with anyone called a brother that is a fornicator or a greedy person [or guilty of another gross sin], . . . not even eating with such a man."
—1 Corinthians 5:11
In another case, Laurie's parents were disfellowshipped. Yet she says: 'My association with them never stopped but increased. As time went on, I became more and more inactive. I got to the point of not even attending meetings.' Then she read material in TheWatchtower of September 1 and 15, 1981, that stressed the counsel of 1 Corinthians 5:11-13 and 2 John 9-11. "It was as if a light bulb were turned on in me," she writes. 'I knew I would have to make some changes. I now better understand the meaning of Matthew 10:34-36. My decision was not an easy one for my family to swallow, for my son, five, is the only boy, and they love him dearly.' It is hoped that losing such association will touch the parents' hearts, as it did Margaret's. Still, the discipline involved helped Laurie: 'I am back out in the field ministry. My marriage and family are stronger because of my change, and so am I.'