Many have been interested in knowing the details of Malcolm-Jamal Warner’s personal life — including if he had siblings or was an only child.

I’ve been dreading the thought of having to write these words all week because it makes the unfathomable real.”

The actor, who died Sunday at 54, was best known for his role as Theo Huxtable, the only son of Cliff and Clair Huxtable, who was based on creator Bill Cosby's son.