The stepfather of missing Tia Sharp screamed with emotion today: "Just find my little girl."
David Niles, 29, said the family were "in bits" as the search for the 12-year-old entered its fourth day.
"I just want to find my little girl," he said, wearing a find Tia campaign T-shirt.
"How would you feel if it was your daughter?
"We're in bits, the whole country has helped us and is supporting us.
Tia was last seen leaving her grandmother's house on Friday
"I haven't slept in four days.
"Natalie (Tia's mother) is in bits.
"The police have done everything."
Tia has not been seen since leaving grandmother Christine Sharp's home in New Addington, south-east London, at around midday on Friday.
Police are becoming increasingly concerned about the welfare of Tia
It was believed the last person who saw her was Mrs Sharp's partner, Stuart Hazell.
But today Mr Niles said he was unsure about that.
He added: "The last time I saw her was on Thursday morning before going to work (at the family home in Mitcham).
"She had a friend stay over.
"She was good as gold.
"I know I am not her real dad, but I have been there since day dot.
"I have fed her and bathed her.
"I just want her home.
"When she left the house she shouted 'Bye' and 'See you by six'.
"She always takes her phone but it was dead."
Mrs Sharp, speaking from her terraced home, said she hoped an image of her granddaughter taken outside the nearby Co-op on Thursday would jog people's memories and bring forward new information.
"We're hoping the pictures will jog someone's memory, yes," she said.
She thanked the community for supporting the family but declined to speak at length.
A man inside the house, who did not give his name, said the family did not want to talk and were going through a terrible time.
Outside the house a solitary candle burned in a glass holder with a plastic bottle covering it.
Tia vanished after telling relatives she was going to the Whitgift Centre in Croydon town centre.
Police have been scouring hours of CCTV footage but said they had not found any trace of the schoolgirl, who has never gone missing before.
Hundreds of Missing posters have been distributed around New Addington and Tia's face looks out from most local shops and noticeboards.
At a bus stop close to her grandmother's house in The Lindens, well-wishers have left dozens of burning candles and tealights with hand-written signs asking for Tia to be brought home.