Friend has cordial vampire and yahenni undying patrician along with 5 1/1s out.

I cast a spell that destroys all his creatures.

He sacrifices a 1/1 to give yahenni indestructible triggering cordial vampire and giving yahenni and all his vamps a 1/ 1 counter.

Cordial vampire along with 4 1/1s die at the same time.

Question is when cordial vampire dies at the same time with the 4 1/1s does yahenni get the five counters or does he only get one from cordial vampire dying? Since cordial says “ whenever he or another creature dies give all vamps 1/ 1 counters”

We just want to know if cordial vampire would trigger for all creatures that died including him when they all die simultaneously. Thanks!