Georgina Gharsallah, 31, was last seen leaving a shop near her home in Worthing, Sussex, on 7 March last year.
She was holding what police described as “a number of mobile phones”.
Her mother, care worker Andrea, works tirelessly in what she now calls her “second job”, handing out posters and raising awareness of her family’s search.
“I often imagine the door being knocked,” she says. “I go to answer and she’s standing there and I just say ‘where have you been you silly thing?'”
Georgina’s two sons, aged eight and nine, have started to wave to photographs of her and say “hello mummy” – it is the closest they can get to her right now.
She is one of 17 missing people whose portraits will feature in a new exhibition which opens next week.
The show, entitled Unmissable, has been organised by the charity Missing People, which supports family and friends looking for their loved ones.
Someone is reported missing in the UK every 90 seconds, according to the charity.
‘We would tell the boys ‘mum’s poorly”
Two men were arrested on suspicion of murder after Georgina went missing but were later released with no further action.
Since she was reported missing, investigators say they have responded to nearly 60 sightings of her.
On some sightings Andrea has dropped everything to rush to the scene to see if she can help identify her daughter, but says her hope “isn’t as strong as in those early days”.
“In the beginning we would tell the boys ‘mum’s poorly’, but as the weeks went on we had to say we don’t know where mummy is but that we and the police are looking for her.
“It’s hard but I have to be strong for them.”
Her family are currently petitioning the council to halt a redevelopment near where earlier reports suggested her daughter had been seen with two “angry” men.
They are calling for the site to be searched before it is built upon.
‘My world fell apart’
Less than 35 miles from where Georgina went missing another family is living with not knowing.
“It was the most horrible day of my life,” says Mohamed Mohamed-Ali.
His wife of 39 years, Fatima, went missing from their Newhaven home on 12 February 2016. She was 52 years old.
“After work I spent about an hour cleaning my car, my colleagues asked why and I told them I was taking Fatima for dinner with my son on Sunday.
“When I got home my world fell apart.”
It has been three years without contact.
Since that abandoned family Sunday dinner, Fatima has missed the birth of their fourth grandchild, a planned hajj to Mecca with her husband, and a trip around the world which her son was hoping to surprise her with.
Mohamed says: “I used to follow some of the high profile missing people cases and you think how and why?
“You never think it will happen to your loved one. I wouldn’t wish it on my worst enemy.”
He added: “If she’s listening – please just let us know you’re safe and well. That’s all I want to know. And know there’s so much help out there for you.”
‘I have lived in hope for 24 years’
The exhibition, in London, will also include a new portrait of former Manic Street Preachers guitarist, Richard ‘Richey’ Edwards – missing since 31 January 1995.
His sister Rachel Edwards says she hopes the work will help raise awareness for the charity which has supported her family since it was founded, a few months after that day.
“For the last 24 years I have lived in hope of solving the mystery of what happened to Richard.
“I am desperate for news as to his fate and am appealing to the public to help me.”
The exhibition is curated by Ben Moore, whose brother Tom has been missing since 2003.
“Since my brother went missing, I have developed a strong connection with Rachel Edwards as we both share the same belief that our brothers are still with us living and breathing on the planet, and the hope that we will one day see them again.”
He added: “The high level of artistic talent and the raw, deeply emotional subject matter at the core of Unmissable makes this one of the most powerful art exhibitions I have ever worked on.”
The exhibition runs from 14 – 17 March at the Old Truman Brewery, in east London.
All of the works will be available to bid on from 5 March, with all proceeds going to the Missing People charity.
Sybil Appelquist (nee Hornby)