der Angehörige
relative
A person who belongs to the family; a relative.
Die Angehörigen des Patienten wurden über seinen Zustand informiert.
The patient's relatives were informed about his condition.

relative / member
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relative
A person who belongs to the family; a relative.
Die Angehörigen des Patienten wurden über seinen Zustand informiert.
The patient's relatives were informed about his condition.

The word 'Angehörige(r)' is a noun, but it is declined like an adjective. The ending changes depending on the article and case.
Ein Angehöriger hat die Polizei informiert.
A relative informed the police.
When it refers to family, the word is very often used in the plural 'die Angehörigen' (the relatives/family members). This means a person's whole family, especially in official contexts such as in a hospital or with the police.
Das Krankenhaus bittet die Angehörigen um einen Besuch.
The hospital asks the relatives to visit.
To name the group or organization, the genitive is usually used. In spoken language, you sometimes also hear 'von' + dative.
Er ist Angehöriger der Universität Freiburg.
He is a member of the University of Freiburg.
employee
'Mitarbeiter' and 'Angehöriger' can both refer to people who belong to a larger group. The difference lies in the context. A 'Mitarbeiter' works in a company, public authority, or organization, or helps with a project. An 'Angehöriger' is usually a family member. The word can also be used for a member of a group or institution, but that often sounds more formal. The words can be confused when an organization is involved. For work and professional contexts, 'Mitarbeiter' usually fits; for family and relatives, 'Angehöriger' fits.

Im Krankenhaus dürfen Angehörige die Patientin am Nachmittag besuchen.
At the hospital, relatives are allowed to visit the patient in the afternoon.
Ein Mitarbeiter der Firma ruft mich morgen wegen des Termins an.
An employee of the company will call me tomorrow about the appointment.