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Rose Tyler's mother Jackie was still alive when last heard of (at the end of "Journey's End"). However, the Jackie Tyler of the parallel universe shown in "Rise of the Cybermen"/"The Age of Steel" (the universe nicknamed Pete's World by the Doctor) was converted into a Cyberman. Later, in "Doomsday", both Rose & Jackie had to escape to Pete's World & were unable to return, so they settled there. (They did briefly return in "Journey's End" but went back to Pete's World at the end.)