what is winston's dream about his mother in the book 1984?

Winston is haunted by dreams of his mother. As the book progresses the dreams get more detailed. Winston recalls himself as a little monster in childhood. He took the rations of chocolate from his defeated mother and sick sister. When he returns, they are gone. He never sees them again. Winston has repeated dreams of his mother and sister in a sinking ship. He watches as they fall into the ocean. He feels they have somehow sacrificed their lives for him.