Both Uses

relative
in
The Thief, by Turner
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I was thinking of my numerous relatives, most of whom I had always considered a grievous burden, but if there hadn't been one that I loved, I wouldn't have landed myself in the king's prison.†
Chpt 7 *
I was taken aback when he put his arms around my shoulders and hugged me like his own son, or anyway like a close relative.†
Chpt 10 *

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.