In The Swiss Family Robinson, what did the mother and sons do on day three?

The famous adventure novel The Swiss Family Robinson tells the exciting story of a family (comprised of a couple with their four sons) left alone off the shore of a deserted island when the ship's crew abandons them after a terrible storm. I am assuming that the question refers to day three after reaching landfall from the wrecked ship. On the first day, the family comes ashore on a makeshift raft, erects a tent, prepares a meal, and eats together. On the second day, the father, William, and the oldest son, Fritz, explore for signs of their lost shipmates and gather some coconuts. When they return, the family all eats together.
On the third day, William and Fritz return to the ship to save the livestock and as many supplies as they can manage. On the boat, Fritz feeds the animals that had been left there. He then proposes putting a sail on the small boat that had carried them and works with his father at this task. He and his father then spend the rest of the day loading their raft with supplies, and then they spend the night out on the boat.
Because the story is told in first person by William, we only learn what the mother, Elizabeth, and the rest of the sons (Ernest, Jack, and Franz) did on day three later, after William and Fritz return. On day three, Jack had made a belt for himself and collars for their dogs out of jackal skin. Elizabeth had helped him with the sewing. Those are actually all the details that the text supplies about what the rest of them do on day three, except that Elizabeth says that it was "spent in anxiety about [William and Fritz], and attending to the signals." In other words, most of what Elizabeth, Jack, Ernest, and Franz do on day three is wait on shore and send signals that all is well.
Only on the morning of the fourth day, when William and Fritz are still on the ship, do Elizabeth and the other boys set out for a walk to explore the part of the island on which they landed.