My father-in-law (not the brightest guy and barely a JW) kicked his 19 year old son out because some elder told him he should because his son was misbehaving. (He was staying out late and partying) Brother-in-law quit the religion completely and later the elders in the congregation disfellowshipped him.
The whole family situation was a mess and lots of regrets by in-laws for the action they took and for listening to a dumb elder who raised two boys himself, neither of which became JWs and which he never threw out of his house. When the matter of how treat DF'd son came up I told my in-laws that there was no prohibition against seeing their son. I said the whole "needed business" thing was very open. So they (and I) continued to see their son frequently and had a much better relationship once he stopped pretending to be a JW. We visited him and ate with him and his partner...and that was while I was an MS and later an elder and later as an ex-elder.
Thirdson