Amos McFly, Nate's grandfather, is a friendly personality and an anthropomorphic fly, he is a man of very old age and has experienced a lot, but nevertheless he still has not lost his youthful spirit and is always ready to go on adventures, most of all he likes to resist the suction power of the vacuum cleaner, but he is already too old for this, but still does not give up trying, even after the old man was sucked into the vacuum cleaner, Amos likes to say "I'm too old." oftenly.