X-Force (1991) #33
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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.
Shatterstar is Gaveedra Seven, the product of bio-engineering on an otherdimensional world, who was at one point merged with an Earth mutant named Benjamin Russell, the nature of whose genetic mutation remains unknown.
Shinobi Shaw is the illegitimate son of Sebastian Shaw, who was rejected and abandoned by his father at an early age and grew tired of waiting to inherit his father's wealth and wearied of the elder Shaw's contempt for his decadent lifestyle.
Silhouette Chord is a descendant of the Dragon's Breadth cult, which spent centuries trying to master the Well of All Things, a hidden interdimensional mystic energy breach in Cambodia.
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.