Help needed: My 5 year old grandson has a anger problem. Six days into kindergarten he stabbed his teacher with a scissors. WTF??? How do we deal wit

Sounds like a parenting problem. By now, they should have taken him to specialists and tested for any physicals deficits, visited a child psychologist, etc. After ruling out all external possibilities, they should seek wise counsel on how to parent. If talk doesn't calm him, then the time-tested and effective tool of spanking will work. If they haven't started, then have someone show them how to do it properly. His behavior need to be corrected and modified, and he needs to learn there are consequences.