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The tree below shows the ancestors of Roger and Carroll Biggins Byrne.
Of the 64 great great great grandparents for Roger and Carroll, 43 are Irish, 8 are German, 5 are Scottish, 4 are British, and 4 are Swiss.
Their children Sean and Daniel, therefore, are 43/64ths Irish, 1/8th German, 5/64ths Scottish, 1/16th British, and 1/16th Swiss.
Roger and Carroll Biggins Byrne Family TreeRoger and Carroll Biggins Byrne Family Tree
12% German 
8% Scottish 
6% British 
6% Swiss 