The Mother of Remo Williams, Dawn-Starr died shortly after Remo's birth. Remo misses the parents he never knew, especially in the latter novels. After seeing a vision of his mother, he has a sketch made by a police sketch artist. This is the closest thing Remo has to a past, and he treasures it.
She makes several appearances, dropping hints about her husband (Remo's dad) to Remo. The reader gets the idea. Remo does not (typical.) She is instrumental in helping Remo find his father, Sunny-Jo - but it takes some effort.
Eventually Remo discovers her grave (#100) with the help of his natural father. Chiun's jealousy is another story.