가 돌아가셔서

because … passed away

→ 가

phrase Uncommon #10,146

because … passed away 가 marks the person as the subject. 돌아가시다 is a respectful euphemism for dying.

KO: 할아버지가 돌아가셔서 가족들이 모였어요.

EN: The family gathered because Grandpa passed away.