This is the 2137th most frequent Chinese word.
家属
"Family member" or "dependent."
The word '家属' here refers to the family members (specifically next of kin or direct relatives) associated with the patient the speaker saw in the hospital.
昨天我在医院看到的那位病人的家属看起来很担心。
Yesterday, the family member of the patient I saw at the hospital looked very worried.
In this sentence, '家属' refers to the relatives or family members of the colleagues who accompanied them to the staff event.
员工聚会中，部分同事带来了自己的家属参加活动。
During the staff gathering, some colleagues brought their family members to participate in the event.
Here, '家属' refers broadly to the family members of people possibly involved in or affected by the accident, highlighting their relationship to the individuals concerned.