How many grandchildren does Martin Luther King Jr have?

He has one grandchild, Yoland Renee King, born May 25, 2008. Her father is Martin Luther King Jr.'s oldest son, Martin Luther III.

(He has four children. Yolanda, who died in May 2007. His other three children, Martin Luther III, Dexter Scott, and Bernice Albertine are still alive at time of writing this, 12 October 2008.