The family of Marioara Rostas said her murder has caused a "dreadful pain, deep down" in their soul.
They have told how the image of her bones in a shallow grave haunts them to this day.
Marioara's brother Dumitru Rostas was with her when she disappeared in Dublin city centre and said he is now "sad all the time".
Asked how he has been since his sister's disappearance, he replied: "How could I be? As her brother, I am sad all the time.
"We grew up together at home and she is no longer here, It's really difficult ... it's hard ... I remember her but it's very difficult ... what can I do? This is it".
Speaking to RTE's Prime Time, he said he has "a dreadful pain deep down" in his soul for the rest of his life.
"My sister and I were together at the roundabout to beg and in two seconds she was no longer there and she doesn't exist any longer. A pain for me. It's very painful," he said.
Marioara's mother, whose name is also Marioara, said her heart aches for her daughter.
"Yes my heart is in pain for life. My heart aches for my family, for my girl who was killed. I am sad together with my whole family and with all my children as long as I will live," she said.
"My heart aches when I cook and I see she is no longer here with us at the dinner table, never again in the family, and my children also cry after her and their heart aches, she was my good daughter."
The dead teen's father Dumitru spoke about how she came to be in Ireland.
"She didn't come with me. I first came with my son and my wife. I arrived in October, 12th of October, and I also stayed in November and on 19th of December my daughter came here together with one of my aunts, the one who passed away," he said.
"She also came for begging because I thought that if we were here with more from the family for begging, we would get more money.
"I thought that we could have money for the family. They were begging there at the traffic lights and she disappeared."
Mr Rostas said: "I do not condemn all the Irish people, because these people didn't do me anything wrong.
"When I came to beg, people helped us and they gave us money so I don't condemn all the people in Ireland.
"I condemn the criminal who killed my daughter without doing anything wrong to him. She didn't know him and I'm sorry that if I knew this was going to happen, I would have never come. I would have rather died at home than to come to Ireland if I knew that my daughter was going to be killed here."
He described how the image of his daughter's remains haunts him to this day.