When Pierre Elwig Elmick Theriot was born on 6 August 1897, in Abbeville, Vermilion, Louisiana, United States, his father, Telesphore Alexandre Theriot, was 40 and his mother, Mary Elvina Fanguy, was 39. He had at least 1 son and 1 daughter with Celima Soirez. He lived in Ward Three, Vermilion, Louisiana, United States in 1900 and Ward Two, Vermilion, Louisiana, United States in 1930. He died on 3 October 1990, in Louisiana, United States, at the age of 93, and was buried in Our Lady Of Lourdes Cemetery, Erath, Vermilion, Louisiana, United States.