What does Joshua 2:12 mean?

'So please, swear to me by the Lord that you’ll show kindness to my family, just like I’ve helped you. Promise me you’ll spare my father, mother, brothers, sisters, and everyone who belongs to them, and save us from death.' Joshua 2:12 - Modern Text Bible

(Rahab asks for protection for her whole family in return for her help, wanting a guarantee that they’ll be safe when Israel attacks.)