How did you cope with the death of a close family member?

We found our younger brother (S) dead on the floor of his bedroom on the day our older brother (J) got married. I called the emergency service. Got the Ambos and cops to come. The coppers separated each of us in the house to question us. As the ambos called in the coroner.
J had to go to his wedding. It was shift change for the cops. The ambos couldn't stay. So I helped the coroner bag the body and carry it out to the van.
Then the rest of the day went by in a blur as I spent it consoling the family. Dad and J was particularly wrecked by it. J went with another family member and I stayed with Dad. It transpired that Dad and J had found S asleep on the floor, passed out drunk two days before and took a photo of it thinking it would be funny to show him when he was awake. That was the last time they had seen him alive.
S worked 14 hour shifts on the weekends and Dad and J rarely saw him. The coroners report stated he had passed away 12 hours before he was found. But Dad and J still haven't forgiven themselves.
I haven't forgiven them either to be honest.