Both Uses

relative
in
Nation, by Terry Pratchett
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She couldn't remember the girl's name, because she had been here only a few days, and was going to tell her off when she did remember that although the girl had arrived with some other survivors, none of them had been her relatives.†
Chpt 9. *
Daphne would like to report that every sailor in the crew was angry because the old man had been shot, and in a way it was true, but many of the men were less concerned about the sanctity of souls than they were about the possibility that the old man had relatives nearby with fast canoes, sharp spears, and an unwillingness to listen to explanations.†
Chpt 11.

Definitions:

(1) (relative as in: the relative importance)
compared with something else (not an absolute value or not complete)
(2) (relative as in: they are relatives)
connected
in various senses, including:
- a person related by blood or marriage -- as in "The hospital won't let me visit her because I'm not a relative."
- a plant or animal related by origin or grouping -- "The closest relative of the dog is the gray wolf."
(3) (relative as in: questions relative to the topic)
related to
(4) (meaning too rare to warrant focus)
More specialized and less common senses of the word are found in philosophy, grammar, and music. Consult a comprehensive dictionary if you wish to see those. All senses have to do with relationships.