Blackburne Vs W Paulsen, 1883

Just a note:  Wilfried Paulsen ranked #12 in the world about the same time that Louis Paulsen ranked #4 (after spending 3 years in the #1 spot).  Surely, they must have been the highest ranked brothers in the world of chess.  Just a guess but the Byrne brothers, Robert and Donald, were the highest rated brothers to date.  Donald was 2633 in 1955 about the time Robert's rating was 2600.