I din't tell---rather, I begged my sister not to marry a Bethelite whom I knew was a big phony. Other family members also asked her to wait/reconsider. She did not take the advice and he turned out to be verbally and physically abusive and a "practicing" alcoholic. She was miserable.
Oh, yeah....and all the JWs we knew thought it was great that my regular pioneer sister was marrying a Bethelite.