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Tony Tyler is the son of Jackie Tyler & the parallel universe version of Pete Tyler. Because his father, although a version of Pete Tyler, isn't the same Pete Tyler who fathered Rose, Tony is her half brother, not her full brother. Tony was born between "Doomsday" (at the end of which Jackie told the Doctor she was pregnant) & "Journey's End" (during which Jackie left him in Pete's care, while she was away fighting the Daleks).