there's no requirement of allegiance.
Is this pretty much standard practice for other clans/socities, or just for ours, which was trying to attract members?
There is no requirement of allegiance to the High Commissioner in my clan society (We do not call him a chieftain as he would not be recognised as such in Scotland). Membership is open to all bearing the family name however spelt or descended by birth, marriage, or adoption.
I find membership in multiple clan societies difficult to comprehend, as it really seems to indicate conflicting loyalties
My thoughts exactly, and precisely why I want nothing to do with a breakaway clan society which purports to represent the family, when there is already a long established clan society.