He is contradicted on their official website.
"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.""
http://www.watchtower.org/e/19880415/article_01.htm
The only 'personal decision' is whether or not to break WT rules on shunning.
Cheers
Chris