This could very well be right! My grandfather, Mack, said upon his father's death, he and a younger brother he refered to as Plez, moved in with older siblings. I know that the younger brother was only a year or two younger. I assumed the older siblings were brothers as I have a picture of him with about 4 or 5 boys. Your information fits with the puzzle. And this is the Mack Roy DeBord that died in Norfolk, VA in 1993.