There are multiple definitions - click on the translation that matches your context.

Betreuer

Substantiv

partial

custodian

noun

Comparative law notes

Germany

This English term has a lot of nuanced meanings depending on the context, but will suffice as a good translation of Betreuer in most cases.

Definitions of custodian

English

a person who has responsibility for looking after property or something else of value or importance, or who has custody of someone (= the legal right or duty to care for a thing or a person)

You need to name a custodian and list the property you're leaving to your child.