The answer to the crossword clue “Bad Advice from Grandpa” is “OLD WIVES TALE.” An old wives’ tale is a type of folk wisdom or superstition that is passed down from generation to generation, often by word of mouth. Old wives’ tales are often inaccurate or misleading and are not based on scientific evidence or facts. In this context, “bad advice from grandpa” may refer to old wives’ tales or superstitions that are passed down from older family members.