Me and DP have gone away for the weekend and we are due back home tomorrow, DS1&DS2 are staying with BIL, which I am grateful for. My eldest has suffered with mental health for a while and is under CAHMS. He's had 2 suicide attempts, the recent one last month. BIL knows this and has told DS that he can talk to him whenever he wants to and they are close. BIL messaged DP as DS has told him he wants to die and that he doesn't see a future for himself, apparently they talked and BIL made him see that he does have a future. DP asked him if DS is ok now and he told him that he's gone out with his friend.
I'm furious that he's allowed him to go out, and I am now 2 hours away from home and I'm worried about him. I have messaged him but I'm not sure what else I can do
AIBU?