See the two links
here (second one includes a video of daughter and grandson speaking, apparently the Periscope video the grandson refers to). The daughter's Twitter page is linked further down that thread.
Looking through her tweets, I noticed that she said she felt her father had "played" MWT. That was my impression
too when watching those first episodes of The Investigator. I thought the programme was pouring salt in the wounds and in view of how the daughter and grandson have now responded wonder if that's essentially its main achievement.