collaterals

Collaterals are things that run alongside or accompany something primary.

In finance, collaterals are assets pledged as security for loans: The bank required collaterals before approving the mortgage.

In anatomy, collateral vessels are secondary blood vessels that develop to bypass blocked arteries.

Family members descended from a common ancestor but through different lines—aunts, uncles, cousins—are collateral relatives rather than direct ancestors or descendants.