BOSTON—Sources confirmed Monday that Walter and Nancy Brandt, grandparents of Boston-area systems consultant Charles Brandt, 31, still do not have the slightest idea what their grandson does for a living. "We are very proud of our Charles," said Nancy, 82. "Whatever he does in that job of his, I'm sure it's very impressive." Said Walter: "I think what Charles does is make sure companies have enough computers and employees so that they can—oh, I haven't a clue." The couple also has no idea what their granddaughter, Erica Haselrig, a Lodi, NJ, human-resources supervisor, does for a living.