The premise for How I Met Your Mother is that Future Ted is telling his two children the story of how he met their mother, revealing more of the story in each episode. The son and daughter appear to be in their early to mid-teens in the year 2030, which is when Ted sits the kids down to tell them the story. They have little dialogue throughout the series, most likely because of the aging of actors Lyndsy Fonseca and David Henrie. In Lobster Crawl, it is shown that Marshall and Lily took Penny to see Santa Claus, as payback for Ted taking Marvin to see Santa for the first time.