Chris Parker, 33, was in the foyer of the Manchester Arena last Monday evening when Salman Abedi detonated a bomb which killed 22 people.
After being blown off his feet in the blast, the rough sleeper risked his own life to save others – including a little girl who lost her legs in the horrific attack.
Jessica Parker (L) said she is 'extremely proud' of her son Chris
It’s exactly the sort of thing Chris would do – he has such a good heart
Jessica Parker, of Sprowston in Norfolk, said she was “extremely proud” of her son and launched a bid to find him after losing contact with him for five years.
She told the BBC: "It was heart wrenching, absolutely heart wrenching to know that he actually still wanted his mum.
"He told me very matter-of-factly what he did and said, 'Mum, I've just done what anybody else would do'.
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Britain's Queen Elizabeth visits the Royal Manchester Children's Hospital in Manchester
"I said, 'I don't think so Chris, I think you did something really wonderful and you need to remember that'."
Last week, Ms Parker revealed she “just wanted the chance to be reunited” with Chris.
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She said: “It’s exactly the sort of thing Chris would do – he has such a good heart,” she said.
“He wouldn’t think twice about helping those poor people.
Vigils have been held in honour of those killed & wounded in the attack
“I’m extremely proud of him and I just feel like I need to get in contact.
“He was knocked down in the blast and he so easily could have died.
“I realised that if that had happened I might have never known about it, which has really upset me the most.
“I am so proud of him but I am so sad for what he’s had to see and go through.”
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Mr Parker regularly went to beg outside the Manchester Arena and recalled hearing a bang and seeing a white flash as the bomb went off.
Speaking last week, he said: "It knocked me to the floor and then I got up and instead of running away, my gut instinct was to run back and try and help.
"There was people lying on the floor everywhere.
"I saw a little girl … she had no legs. I wrapped her in one of the merchandise T-shirts and I said 'Where is your mum and daddy?' She said, 'My dad is at work, my mum is up there'."
He also tended to a woman who was badly hurt from the bombing with serious leg and head injuries.
Mr Parker said: "She passed away in my arms. I haven't stopped crying."