The Last Cuentista by Donna Barba Higuera (2021) Levine Querido

Something has altered the flight of Halley’s Comet and this time it is going to impact Earth.  On this premise, several countries, including the U.S., have developed extra large rockets that can take humanity to other solar systems.  Most of the passengers will sleep during the entire trip.  Some will stay awake for generations to watch over their quiet charges.  The story is told from the point of view of a teenage girl whose parents are professors and her little brother.  But the real conflict is a group of people who think our history is what went wrong with humanity.  And they become in charge of the society running the ship.