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).

Based on that paragraph can we conclude that this sentence is true?
Sammy Jo Carrington's mother is Krystle Carrington's sister. 

Possible answers:
a). Yes;
b). It's impossible to say;
c). No;
b).