Question: When was the great uncle of the creator of the Broadway musical "Hamilton" and founder of the Puerto Rican Independence Party born?
Sentence (from "Gilberto Concepción de Gracia"): Dr. Gilberto Concepción de Gracia (July 9, 1909 – March 16, 1968) was a lawyer, journalist, author, politician and founder of the Puerto Rican Independence Party.
Relevant evidence: Yes