Relationships are mentioned in the Quran in these verses:

[33:5] You shall give your adopted children names that preserve their relationship to their genetic parents. This is more equitable in the sight of God. If you do not know their parents, then, as your brethren in religion, you shall treat them as members of your family. You do not commit a sin if you make a mistake in this respect; you are responsible for your purposeful intentions. God is Forgiver, Most Merciful.

[37:158] They even invented a special relationship between Him and the jinns. The jinns themselves know that they are subservient.

To learn more, read the Quran in English.

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