X-Force (1991) #5
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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 and eventually hooked 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.
British-born Mortimer Toynbee, abandoned by his parents so early in childhood that he cannot remember them, was placed in an orphanage where the other children, who regarded him as a freak due to his ugliness, his unusual physique and his leaping ability, continually tormented him.
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.