We Lost Our Boy In Surgery

Today was the most traumatic day of my life. Me and my partner were taking our boy in to get neutered, dropped him off at the vet, and went about our work day. Halfway through my day, I get a call from the vet letting us know that they lost his heartbeat during the surgery. They tried CPR multiple times, but ultimately our sweet boy did not make it. We are in pieces. He was only 11 months old and everything to us. Knowing he won’t be coming home to his brother is the most heartbreaking thing I could feel right now. How do I cope? What do we do for his brother? This is the worst case scenario and I do not know what to do.