A lineal descendant of a particular person or family is someone in a later generation who is directly related to them. = direct. related directly to someone who lived a long time before you
arranged in a line in a straight unbroken line of descent from parent to child; "lineal ancestors"; "lineal heirs"; "a direct descendant of the king"; "direct heredity
(Law) person who is a direct offspring, direct descendant (children and their children down through the generations, including grandchildren, great-grandchildren and so forth)