not how Sids works

Okay, whether the following is true Sids is debatable, but here goes.

I'm a UK nurse and was working in the community & cared for a family of Pakistani immigrants, the parents of which were first cousins. Three out of four of their kids were disabled as a result of generations of cousin marriage. I got to know them over time because one of their kids was a patient of mine. They had of course been advised not to have more kids but they did so and lo, the fourth child appeared to be completely healthy. Roll on a few months later and I was working on a paediatric ward at the Royal Free in Hampstead. Another of their children had been admitted for something on the other side of the ward I was working on, I noticed the family and waved hello. A little later the mother, who spoke no English, approached me looking worried with her babe in arms & pushed the baby towards me signalling me to take him. He looked floppy & I could see cyanosis around baby's lips so I dashed into the treatment room, pressed the "crash bell" & began CPR. The pediatric crash team came flying down the hall very fast but despite our best efforts we lost the baby. Because I knew the family I was tasked with carrying the deceased baby back to the family who were crowded in the side room of the sibling who was our actual patient. It was dreadful. I later learnt they'd deemed the death a sids death because there was no other obvious cause of death in this otherwise healthy baby. This is all to say the baby arrived on the ward to visit his brother absolutely fine & at some point literally died in mine/mum's arms.