However, you can say kangaroos are closely related to:
* Other Macropods: This includes wallabies, quolls, and pademelons. These animals share the characteristic of having large hind legs and strong tails for hopping.
* Other Diprotodonts: This is a larger group of marsupials that includes kangaroos, wombats, koalas, and possums. They all have two large lower incisor teeth.
So, while you can't point to one specific animal as a cousin, kangaroos are part of a large and diverse family of marsupials!