Andrew's acts and behaviour may well be viewed as treasonous by some, if not many, ie. a treasonous act is one that damages the monarch.
The Crime and Disorder Act 1998 formally abolished the death penalty for this offence, replacing it with a maximum sentence of life imprisonment. The last person executed for treason in the UK was Lord Haw Haw, in 1946.
The Treason Act 1351 remains the basis for treason but is considered largely dormant or outdated for modern threats. There have been calls to update this law to deal with modern terrorism.
Tuliptree 00.06 "Monica but they are not any family are they?"
They may not be 'any' family, whatever that means, but they certainly are A family. Factually the RF individuals collectively constitute a family; they are human beings with emotions, differing personality traits etc just the same as you and I. They factually experience all the complications, ups and downs, births marriages and deaths, disagreements and arguments that all and "any' families experience. No matter what AMW has done and even though all titles, privileges etc have been taken away from him- he still and always will -whatever happens- remain a family member.
Brothers/sisters/mothers etc are not usually party to the intimate details or email correspondence of their family member's life, behind closed doors, and can see no reason why that would be any different for the RF. Hence why the R protection officers are being interviewed.
I accept the public's trust has been impacted as a result of AMW's behaviour- as we can see in multiple differing concerns and speculative opinions as to what the RF knew or did not know. However a case can not be made that the monarchy does not comprise of a family. Neither can it be said that they care not experiencing a conflict between their royal role/duties/ responsibilities/public image risks alongside their role as a family member to AMW.