So, the pieces come together this way: you're a 1946 boy, the Arno you met was about your age, and Bill Brill's son named Arno was born in '48. My 'new theory', then, is that because there was an Arno William Brill (Sr.), who was August's son; and Arno had a son with the same name (so Jr.); the chap you met thinks of himself as the third Arno William Brill and so calls himself III. His birth certificate calls him II, which would be incorrect because there is no "II"; instead these men are called "Jr.".

All good fun :-)

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Red Nichols The Holstorian