Sammy Jo Carrington (born Samantha Josephine Dean; formerly Fallmont) is a fictional character on the ABC television series "Dynasty", created by Richard and Esther Shapiro. The niece of central protagonist Krystle Carrington (Linda Evans), Sammy Jo marries and has a son with Steven Carrington (Al Corley, later Jack Coleman).
Sammy Jo Carrington's mother is Krystle Carrington's sister. 
The context states that Sammy Jo is Krystle's niece, but does not explain if the relation is maternal or paternal. 