He remembered that it was the first prayer they learned as children, but didn't indicate that it was only a mealtime prayer. My children use it as a prayer to this day.
Memory is an amazing and powerful gift.
Dad is the 5th of 10 children and remembered his mother singing that lullaby when she rocked the babies to sleep. At a family reunion this past summer, Dad again led the singing of the same lullaby as descendants circled the grave of my maternal grandparents. Sadly, there were only four of his generation who could sing it with him. It was a powerful moment for all who were there. The grandchildren were especially moved by the entire scene.