Video Shows Heartwarming Moment 5-Year-Old Girl Meets Great-Grandmother With Dementia for the First Time

— -- One little girl's sweet serenade to her great-grandmother who has dementia is filling viewers' eyes with tears.

"The entire family is amazed, shocked and so proud of Sophie's video and the millions of shares, comments from people all over the world who have been touched by her," said Sophie's grandfather, Sandy Miller. "Sophie started to sing on her own and we felt surprised and so proud."

"[We were] also delighted at the reaction of great nana," Miller said.

Miller, of County Offaly, Ireland, told ABC News that on Aug. 17, he and his family took Sophie Flynn, 5, to meet her great-grandmother Brenda, 82, in the nursing home for the very first time.

Miller said that Sophie's mother Sarah was concerned that her daughter would be frightened by the encounter.

Instead, Sophie hopped onto the bed and began to stroke her great-grandmother's face, all while soothing her with song.

"She has late-stage dementia and is partially blind," Miller said. "She was smiling, tried to sing along with Sophie."

The video, which was posted on YouTube on Aug. 24, has since been viewed more than 400,000 times.