Sorry, the translation is quite long, but if you're talkingabout an older sister, "he nani no ku'u kaikua'ana" or my oldersister is beautiful. If you're talking about a younger sister, "henani no ku'u kaikaina" or beautiful is my younger sister. Groupingjust the sisters together for a phrase cannot be done. This howevermay work, "he nani no ku'u 'ohana", my family is beautiful.