Sibyl La Grenade nee Sylvester was born in Carriacou on May 15, 1924. She was brought to Grenada at the tender age of two weeks. She resided in St. David's with her parents. Her father, Cyril St. Bernard Sylvester, was the principal of St. David's Primary School, which she attended until she began her secondary school education at St. Joseph's Convent in St. George's. She successfully completed her Senior Cambridge in 1939. Having placed second in the island she was awarded a scholarship to study nursing in England. Her protective father, reluctant for her to leave the island, encouraged her instead to begin teaching at a catholic primary school in St. George's which was known at that time as "Mother Rose" School. She  actively became involved in needlework and cookery and eventually qualified as a home economist. 

Following her marriage to Allan La Grenade in 1949, Sybil put her teaching career on hold in order to raise her children. She raised 5 daughters and other children. When her youngest child, began attending school she returned to work teaching Home Economics at a primary school. She later became a school supervisor training Home Economics teachers in Grenada. It was at this point in the late 60's that she started de La Grenade Home Products, which has now evolved  into de La Grenade Industries. The development of her business was interrupted in 1973 when she was forced to leave Grenada during political upheaval on the island. Her husband Allan La Grenade who was retired at the time continued her cottage industry. He had spent most of his life as Chief Education Officer of Grenada and later became the Cabinet Secretary prior to his retirement from the civil service. He then became the General Manager of the Grenada Breweries. Allan developed the de La Grenade Rum Punch formula that is still used today.

Sibyl La Grenade was suddenly and tragically killed in 1991 in a car accident in Maryland, USA.