Speaking about seeing her dad recreated for the movie, Violet Ramis Stiel said, “It is a character. Jason, smartly, focused on capturing the Egon character and not necessarily my dad. I feel like it really worked in that way. Ultimately, it leaves us with that feeling: The people we love are always with us. They don’t go away.”
Source: https://www.buzzfeed.com/noradominick/actors-added-into-movies-commercials-after-death