X-Force (1991) #67
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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.
When Tabitha Smith's mutant nature manifested at age 13, she ran away from her abusive home before eventually hooking up with the New Mutants and, subsequently, X-Force.
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.
Growing up in a wealthy Brazilian family, Roberto da Costa was forging a career as a skilled soccer player until his mutant nature manifested during a match.
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.