Life didn't stop for us, we powered on and did what we had to do
– Alison Ross on life after the loss of her sister Joanna in the Dunblane shooting
Twenty years on from the deadly massacre at Dunblane Primary School, Lorraine is joined by Alison Ross whose elder sister was one of the 16 children killed along with their teacher on that terrible day.
Ali Ross was just four months old when sister Joanna lost her life in the senseless shooting, an attack that remains one of the deadliest gun crimes in British history and has left indelible scars on the small Scottish town and those involved.
Now aged 20 and a mother-of-one, Ali says she still feels the void left by the sister she never knew.
Knowing there should have been someone teaching me, you feel there is something not there
– Alison on the sense of loss felt following the death of her sister, Joanna, in the Dunblane tragedy
Ali was about seven when her parents finally told their increasingly curious second daughter about her older sister and the atrocity that claimed her life.
In a moving interview with Lorraine, who first met the Ross family while reporting on the tragedy, Ali said: ''I remember having dreams about it but not understanding how she died. I always saw pictures around the house (of Joanna) and thought it was me. I didn't know the whole story until I was six or seven."
Five years after the unthinkable atrocity, Ali attended the same primary school where her sister was killed along with her classmates and their teacher when a gunman opened fire during a PE lesson before turning the weapon on himself.
Talking about her own experience, Ali said: "People found it difficult to talk about what happened. It was like the elephant in the room.
"People didn't want to talk to me about it because they didn't know how I felt or how I'd react."
Ali admits it is difficult for her to fathom why someone would inflict so much suffering and pain on so many innocent people.
"Why would someone be so angry that they'd want to take it out on children?" she said.
Ali's mum Pam was an organiser of the Snowdrop petition that helped secure a ban on private ownership of handguns.
"Something had to change and it did change," Ali said.
Ali now has her own family, she has a son called William who is about to turn one-and-a-half. She says the hardest part will be telling him.
"I should never have to explain this to him," Ali said, adding that the Dunblane tragedy will affect generations to come.
In a landmark film to commemorate the 20th anniversary of the tragedy, Dunblane: Our Story features Ali, her family along with other relatives of the victims and some survivors who have never before talked publicly about what happened on that day.
The documentary airs tonight at 9pm on BBC Two and BBC One Scotland.