Hi mom2ela
Dealing with suicidal threats isn't easy. Even when we think the person might not actually want to take their own life, engaging in suicidal threats and gestures is still a very dangerous thing to do. I am very sorry you are dealing with this.
When you first joined our site you talked about how your son was formally diagnosed with BPD yet unfortunately got removed from DBT and residential treatment did not help very much. You did say back then that you were starting a new DBT group, how did that work out?
Where is your son currently staying?
You say he does not want to go back to the hospital, for what was he in the hospital before? Also for his suicidal ideation?
We have some resources here that might help you better deal with your son's threats:
Dealing with suicidal ideation in othersTake care
The Board Parrot