My stance Jim,
Edward was guilty as charged,we have known about his sympathies for many years.
The rest of the family,I really don't know.
Their actions in later years didn't show any sympathies,what their private thoughts were I have no idea, just as I don't know what your thoughts are unless you tell me.
Photographs and films are open to speculation,we only see what the lens allows us to see,we have no idea what is going on out of shot.
Are they really giving Nazi salutes,or waving to someone off camera as claimed?
Was the lip readers report correct or not?
Would someone else have lip read read the film differently?
"Inconclusive" remains my opinion,I don't see any thing to make a firm decision either way.