Roosevelt continued to follow it until his death in 1945 .
Franklin Delano Roosevelt , stirred by family stories originating from his sailing and trading grandfather ( and Oak Island financier ) Warren Delano , Jr. , began following the mystery in late 1909 and early 1910 .
Franklin Delano Roosevelt continued to follow Oak Island until Franklin Delano Roosevelt 's death in 1945 .
Franklin Delano Roosevelt , stirred by family stories originating from his sailing and trading grandfather ( and Oak Island financier ) Warren Delano , Jr. , began following the mystery in late 1909 and early 1910 .