relation
US /rɪˈleɪ.ʃən/
UK /rɪˈleɪ.ʃən/

1.
the way in which two or more people or things are connected
:
•
The relation between cause and effect is fundamental to science.
•
There is a close relation between diet and health.
2.
a person connected by blood or marriage; a relative
:
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She invited all her close relations to the wedding.
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He is a distant relation of mine.