Question: John Carroll Power served as the first custodian of a tomb of a president and how many of his sons ?
Sentence (from "John Carroll Power"): John Carroll Power (September 19, 1819–January 11, 1894) was an American historian who served as the first custodian of the tomb of Abraham Lincoln, the 16th President of the United States, at Oak Ridge Cemetery in Springfield, Illinois from its opening in 1874 to his death in 1894.
Relevant evidence: Yes