The Secret Island - pt. 2

T1, E2: After retreating to an island, the children befriend Jack, an orphan who has run away from home. Unbeknownst to the children, their father Thaddeus and Charlotte are still shipwrecked on an island themselves. Uncle Henry and Aunt Harriet having discovered that the children have run away, decide not to tell anyone in case it reveals their plans to sell the estate.