Consanguinity (noun)

1. The state of being related by blood; blood relationship.
2. A close relationship or connection between people or things.

Origin:

Late middle english: from latin consanguinitas, from consanguineus (see consanguineous).

Examples:

1. The consanguinity between the two families was strong, with many marriages and close friendships.
2. There is a consanguinity between music and poetry that has always been evident to me.
3. Many cultures place a strong emphasis on consanguinity and the importance of blood relationships.
4. The consanguinity between the two nations was strengthened by the signing of a trade agreement.
5. Despite their consanguinity, the two siblings have very different personalities and interests.