This chicks seems to be looking for its parents, who might well be both off to sea to forage. When they are, the abandoned chicks start to wander around in search for a meal.
Emperor penguins lay just one single egg and evolution-wise it doesn’t make sense for them to feed other penguins babies. The whole process of laying that precious egg deep in the hazardous polar winter and raising the chick by trekking many miles on the sea ice to the open sea to feed is so difficult and dangerous they cannot afford to feed other chicks than their own. So seeing scenes like this, an adult with two chicks, doesn’t mean they are both his or her offspring. They could even be both random chicks, seeking shelter with a random adult.
Chicks looking for their parents and parents looking for their chicks, the daily routine in a Emperor penguin colony.