Michael Horton
Grady Fletcher

He played Grady Fletcher, Jessica's nephew, from the first episode "The Murder Of Sherlock Holmes" (episode no. 1 - 09/30/1984) until 1995 in "The Dream Team" (episode no. 237 - 03/19/1995).
He also played Grady Fletcher in the next episodes: 12, 34, 41, 57, 63, 77, 85, 89, 97, 131 (for further info about the episodes' titles see the Episode Guide ).