The relationship between a lawyer and her client would be considered a/an relationship, and the relationship between an aunt and niece would be considered a/an relationship.

"Impersonal"  "Personal"

Explanation:

The relationship between a lawyer and her client would be considered an impersonal relationship, and the relationship between an aunt and niece would be considered a personal relationship.

Impersonal relationship is mostly that type of relationship which is not so personal in the sense that the person involved could be someone who you work with, someone you transact with, or generally the members of the immediate society.

Personal relationship will then be a form of close or deep relationship between two or more people and this could be a family or close ones.

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hope this .