What does Joshua 2:18 mean?

Behold, when we come into the land, thou shalt bind this line of scarlet thread in the window which thou didst let us down by: and thou shalt gather unto thee into the house thy father, and thy mother, and thy brethren, and all thy father’s household.

Behold, when we come into the land, thou shalt bind this line of scarlet thread in the window which thou didst let us down by: and thou shalt bring thy father, and thy mother, and thy brethren, and all thy father’s household, home unto thee.

Behold, when we come into the land, thou shalt bind this line of scarlet thread in the window which thou didst let us down by: and thou shalt gather unto thee into the house thy father, and thy mother, and thy brethren, and all thy father’s household.

If, when we come into the land, you put this cord of bright red thread in the window from which you let us down; and get your father and mother and your brothers and all your family into the house;

lo, we are coming into the land, this line of scarlet thread thou dost bind to the window by which thou hast caused us to go down, and thy father, and thy mother, and thy brethren, and all the house of thy father thou dost gather unto thee, to the house;

If, when we come into the land, this scarlet cord be a sign, and thou tie it in the window, by which thou hast let us down: and gather together thy father and mother, and brethren, and all thy kindred into thy house.

Behold, when we come into the land, thou shalt bind in the window this line of scarlet thread by which thou hast let us down; and thou shalt gather to thee in the house thy father, and thy mother, and thy brethren, and all thy father's household;