Hi !!
whose introduces a relative clause indicating a posession by people, animals, things....
the owner is before whose and the people, animal, thing just behind.
An example =
My friend, whose sweater was lost, had to go back to the restaurant to try to find it.
We met our friend whose sweater was lost.
Kate whose sweater was lost was very cold.
Tom whose sweater was lost came with us to warm up in a coffe shop.
Here are some examples. Sorry if my english isn't that good (I'm French) but I'm sure about whose
hope I helped :)
