In a Nutshell: Think of
家属 (jiāshǔ) as the word you'd see on a form, not in a family photo album. It refers to family members to whom you have a legal or official connection and responsibility—like a spouse, children, or parents you support. It's a formal, neutral term used by institutions like hospitals, companies, or the government to refer to one's family. It lacks the warmth and emotional connection of the more common word
家人 (jiārén).