X-Force (1991) #56
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The daughter of former X-Men member Sean Cassidy, a.k.a. Banshee, and Maeve Rourke, Theresa Rourke was raised by her first cousin once removed, mutant terrorist Thomas Cassidy, a.k.a. Black Tom.
James Proudstar was once a member of Professor X's New Mutants and is currently a member of the X-Men black ops team, X-Force.