Besides saving two lives, there are many advantages to adopting kittens in pairs. Kittens tend to need more time and attention than adult cats, and two together will keep each other company. The acclimation to a new home will go smoother, too, because a bonded pair of kittens won’t need separate transitional rooms.
http://hydeparkcats.org/two-kittens-the-benefits-of-adopting-in-pairs/