I was recently doing some research on behalf of a visitor at out research centre and found that one of her great grandfathers had been more than a "naughty boy". Newspapers reported that on his first conviction for running a disorderly house that he was "well acquainted with prison life".
When I broached the subject on her next visit, she was delighted. She now had some scandal to report to the family, whose attitude up until then was probably at best lukewarm.
Of course, it had to be her decision whether or not to tell her relatives. She reckoned that they would be fine with events of over a century ago.