ตอนจบของ don t breathe ภาค มีความหมายอย่างไร

He has seven beautiful sisters. They are all crazy about their younger brother, but they don't know that he has already become a king who could make the world tremble! His elder sister, Queenie, is a cold-faced CEO! His second elder sister, Tracy, is a skilled doctor! His third elder sister, Alice, is a seductive killer! His fourth elder sister, Kate, is a beautiful reporter! His fifth elder sister, Angela, is so mysterious! His sixth elder sister, Anita, is the best actress! His seventh elder sister, Bertha, has an extraordinary identity...... Fifteen years ago, you treated me as your family. Fifteen years later, I will protect you in return.