Yes. Shemar Moore is often quoted as "the only child" in a number of articles written about him. Despite having half siblings (Kosheno, Sheburra, Romeo and Shenon), Shemar is the only child of Sherrod Moore and Marilyn Wilson.
Moore's father is African American and his mother, who was born in Roxbury, Massachusetts, is of Irish and French-Canadian descent.
His parents had been free spirits in the early 1970s—his name is a combination of the first three letters of each of theirs—and first they lived in Denmark after his birth, trying to flee racial unrest in America.
When their marriage broke up, his mother took a job as a teacher in Bahrain; thus Moore was enrolled in a school for the children of British nationals, where he soon picked up a plummy accent.
For fun facts and trivia, see his IMDb page.