The Doctor flicked a switch with his free hand and carefully bought the TARDIS into land. He checked the scanner and saw that they landed in a sewer below London. It seemed an odd place to find Jackie Tyler, but then if she was hiding it must've been the only safe place.
The Doctor pushed his glasses onto his nose before going to check on Rose. She was lying on her bed looking at him mournfully, clutching her stomach still.
"I've found your Mum," he said quietly, putting Jack down beside him as he sat on the bed. He brushed a strand of hair of Rose's face gently. "Do you want to come, or shall I find her?"
"I'll come," Rose replied, sitting up gingerly and making to pick Jack up.
"I'll take him," the Doctor said and Rose smiled gratefully. Picking Jack up with one arm and holding his hand out to Rose he headed for the console room.
"What about Jack and Charlie?" Rose asked as the Doctor checked the scanner again before heading for the doors.
"They'll be alright," the Doctor said. "We'll fetch your Mum and she can stay with us until I can sort out Torchwood."
"Did you find Mickey?" The Doctor paused just as he opened the door into the dark, smelly sewer.
"The TARDIS could only track one person at a time," he said. "Don't worry; she's tracking him as we speak."
Rose nodded, linking her fingers through his. The sewer was hardly the place to take a two year old, but, after what they'd just been through, both the Doctor and Rose were reluctant to leave Jack behind.
Their feet splashed through the few inches of water that covered the wall as they walked forward.
"The TARDIS said she was round here somewhere," the Doctor said glancing round for any sign of Jackie Tyler.
"Mum?" Rose called, her voice echoing up the pipe.
"Rose?" A voice came floating back from not far ahead. Jackie Tyler stepped out of the shadows and looked worse for wear. She was covered in dirt and her hair hung limply about her shoulders. When she caught sight of Rose, the Doctor and Jack she broke into a run. "Rose!"
Rose met her Mum in a tight hug, looking as if they'd never let go of each other. The Doctor could hear them mumbling to each other but couldn't make out what they were saying above the sobs.
"We had to hide," Jackie said when Rose finally pulled back to look at her. "Torchwood where after us, after you, and…"
Jackie stared suddenly seeing the Doctor properly.
"Who's he?" She asked wondering who on Earth was trustworthy enough to hold her grandson. "And where's the Doctor?"
"That's him Mum," Rose said wiping her tears and turning to follow her mother's gaze. "I told you about regeneration remember?"
Jackie nodded still not quite convinced. Jack waved holding his arms out to Jackie expectantly.
"I think he wants to say hello," the Doctor said smiling slightly as he held Jack out to Jackie.
"Hello my favourite grandson," Jackie said kissing him and making him giggle.
"Do you know where Mickey is, Mum?" Rose asked as the three of them walked back towards the TARDIS.
"Oh, god Mickey!" Jackie stopped suddenly. "You better wait. He's just gone to fetch some more food."
She explained everything then. Apparently four months earlier Torchwood had started sending people round, asking questions about the Doctor and Rose and their son. Jackie had known it was bad because only they knew about Jack. Mickey had done some snooping of his own and found that Torchwood planned to kidnap them and use them to bring the Doctor and Rose to them. So Mickey had suggested hiding. Of course Jackie hadn't realised that Mickey meant the sewer system. But with cameras all over the city it was the only safe place left.
"Jackie?" A shout from down the pipe stopped the story.
"Up here Mickey! Rose and the Doctor are here too!" Jackie called back. They heard splashing as Mickey flew up the pipe towards them, almost knocking Rose over when he hugged her.
"Hey careful!" The Doctor complained. "She's not feeling well!"
"Sorry, I-" Mickey froze and looked at the Doctor confused.
"I regenerated," the Doctor replied, before Mickey could open his mouth. Mickey nodded still looking at the Doctor disconcertingly.
"C'mon," the Doctor said taking Rose's hand again. "We better get back to the TARDIS. We've got two other tenants at the moment."
Jackie was still cooing over Jack as they wandered into the TARDIS, Mickey following. Jack and Charlie appeared seemingly from nowhere and as they introduced themselves to everyone, Rose leant against the Doctor.
"Are you ok?" He asked.
"Yeah," she replied, a hand resting subconsciously on her stomach.
"Are you sure?" The Doctor asked wondering whether his pain redirection had failed.
"I can't sense it," Rose said worriedly looking up at the Doctor. "The baby, I can't feel it."