My Grandson, 18 Years Old Has Been In And Out

My grandson, 18 years old has been in and out of psychiatric care for several years. He is now back again after shooting himself with a pellet gun in the chest. His longest term was at Immanuel, Omaha, NE and threatens suicide. He wants to come home, but there are 3 other siblings at home, and his parents are unsure if he would harm them. Please help.
YYYY@YYYY Parents; John and Darlene Kolterman, Colon, NE 402-647-2040