Robert and Charlene's devastated mum Karen says she will "never be the same again".
"Losing him as well as Charlene is just too much - I know it's been 18 years, but it doesn't get better. I'll never be the same again," the 56-year-old told the outlet.
"Robert was the baby of the family, and my only boy. I already know what it's like to lose a child and it's not something you can ever get over.
"There are no Christmas decorations in our house. There'll be no Christmas Day for us. It's absolutely devastated me."
Robert's tragic death comes 18 years after Charlene vanished without a trace in November 2003.
Despite a murder trial and a lengthy and controversial investigation, the largest in Lancashire Police’s history, her family are no nearer to finding out how and why she died.
Two local takeaway workers stood trial for Charlene’s murder in May 2007 but were not convicted.
Speaking to the Sun Online in 2019, Karen said: “There were reports that Charlene had been groomed and drawn into the sex trade which broke my heart.
“My daughter wasn’t here to speak up for herself so it seemed people could say just what they liked. But when I looked back there were occasions when Charlene had skipped school and I didn’t know where she had been.
“She once came home with £70 and we couldn’t get the truth out of her. We didn’t know where it had come from. She had cigarettes too and we didn’t know who was buying them for her. Now, it was all slotting into place.
"It was suggested in court too that, after she was killed, her body had been cut up and mixed into kebabs. It was horrific to listen to. As a mother it almost broke me."
New CCTV of Blackpool teen Charlene Downes who disappeared in 2003