In the animated family film "Meet the Robinsons" young inventor Lewis finds himself whisked away to a Jetsons-like future which was all made possible by the inventions of genius Cornelius Robinson. He meets the eccentric extended family of Robinson, including the inventor's parents Bud & Lucille. By the end of the film, Lewis finds out that Cornelius is actually
a grown version of himself, having been adopted by Bud and Lucille, with Cornelius being a nickname given by Bud.
Bud has issues with his memory, but Lucille doesn't seem to. With this in mind, how was Lewis not recognized by either one?
Note: Sorry - there's really no way to ask this question without spoilers...