(CNN) Nine people representing four generations of an Idaho Falls family were killed in a plane crash in South Dakota while traveling for a hunting trip, according to a company where two of the victims were executives.

Brothers Jim and Kirk Hansen, founders of health and wellness company Kyäni Inc., were on the single-engine Pilatus PC-12 with their father, Jim Hansen Sr., when it crashed after takeoff Saturday in Chamberlain, South Dakota, Kyäni president Travis Garza said in a statement . There were three survivors.

Kirk Hansen, left, and Jim Hansen Jr. were among the nine killed in a South Dakota plane crash.

Also killed in the crash were Jim Hansen Jr.'s son, Jake Hansen, and Jake's son, Houston. Kirk Hansen's sons, Stockton and Logan, and his sons-in-law, Kyle Naylor and Tyson Dennert, died in the crash.

"We are deeply sad to announce that yesterday, we lost our precious founders Jim and Kirk in a tragic plane crash," Garza said in a statement that identified the family members. "We are all mourning and ask your prayers."

Jim and Kirk Hansen each had sons who survived, along with one of Jim Hansen Jr.'s sons-in-law, Garza's statement said. They were transported to hospitals in Sioux Falls, South Dakota.