So not only does this man have a well documented history of abuse, both physical and emotional, he is also a raving lunatic.
Its time for the Behns and H&S to get those girls away from him. ML has made her bed, let her lie in it but her daughters need to be protected.
I don't know about the Behns, but I don't expect anything drastic from Harold and Sonja, and even less from Haakon or Mette-Marit. I like the Norwegian RF well enough but they seem to be very hands off when it comes to discipline. Martha L. has had "issues" from a long time back, and look what Haakon was allowed to marry, and how they tolerated MM's vacations, her chasing rich guys, and lack of worth ethic all from way back.
The best thing would be to enforce the PRINCESS title never being used at ANY time outside Norway & insist on ML moving permanently to CA (without any of her daughters) and keeping both these nutbags far away from the nucleus of the RF. Pay her to stay away if necessary, or at least make her allowance contingent on this ... Make it absolutely plain Shameman is NOT WELCOME in Norway and ML will naturally keep away too, while she's in his thrall.
This back-n-forth between Norway and CA and the RF's continued tolerance of him at family occasions like Xmas & so on will only keep doing damage. If they can do nothing else at least restrict his access to their family occasions.
But of course nothing will actually be done.