Page 116 has this interesting directive on disfellowshipping that I was not aware of:
6. If members of the congregation are known to have undue association with disfellowshipped or disassociated relatives who are not in the household, elders should counsel and reason with those members of the congregation from the Scriptures.
If it is clear that a Christian is violating the spirit of the disfellowshipping decree in this regard and does not respond to counsel, it may be that he would not qualify for congregation privileges, which require one to be exemplary. He would not be dealt with judicially unless there is persistent spiritual association or he openly criticizes the disfellowshipping decision.
So you CAN associate with disfellowshipped relatives without fear of being DF'd yourself, so long as you don't discuss spiritual things!