All 4 Uses of

relative

in

Frankenstein - 1831 version

Besides, the strange nature of the animal would elude all pursuit, even if I were so far credited as to persuade my relatives to commence it.
p. 79.2

relatives = people connected by blood or marriage

I felt the greatest ardour for virtue rise within me, and abhorrence for vice, as far as I understood the signification of those terms, relative as they were, as I applied them, to pleasure and pain alone.
p. 132.1

relative = in comparison to each other

Among the lessons that Felix had bestowed upon Safie, geography had not been omitted; I had learned from these the relative situations of the different countries of the earth.
p. 141.5 *

He might remain in Switzerland and wreak his vengeance on my relatives.
p. 167.1 *

relatives = people related by blood or marriage

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