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Originally, there were 4 brothers (although Malcolm's oldest brother attended a military school away from home, so Malcolm was still the middle sibling left at home). The fifth child was introduced in the show's fourth season but his conception was not mentioned until Season 5. The boys are, from eldest to youngest: Francis, Reese, Malcolm, Dewey, and Jamie. In the last episode Lois discovered she was pregnant with a sixth child.

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