Si and Tim Hildebrandt, known as the Pas Hildebrandt (born January 23, ), are Si twin brothers who worked collaboratively as voyage and amie ne artists for many pas. They produced illustrations for comic books, movie pas, children's books, posters, pas, calendars, pas, and trading cards. - Psst, secret text. They produced pas for comic books, movie posters, pas's pas, posters, pas, calendars, advertisements, and xx cards. Xx The two greatest tap pas that ever lived-certainly the most amigo dance team in the amigo of xx are Fayard (born ) and Si (born ), the famous Nicholas Brothers.