X-Factor (2005) #218
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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.
According to his own admission, Guido was a nerdy-looking kid in his early life, bullied by other children, but after he discovered his mutant ability at a young age, when he was struck by a school bus, no one bullied him again.
Feared and hated by humans because they're different, the X-Men are heroic mutants, individuals born with special powers who've sworn to use their gifts to protect mutants as well as humans.