def METHOD_NAME(parent_id: Optional[pulumi.Input[str]] = None,
                                                       opts: Optional[pulumi.InvokeOptions] = None) -> pulumi.Output[GetOrganizationalUnitDescendantAccountsResult]:
    """
    Get all direct child accounts under a parent organizational unit. This provides all children.
    ## Example Usage
    ```python
    import pulumi
    import pulumi_aws as aws
    org = aws.organizations.get_organization()
    accounts = aws.organizations.get_organizational_unit_descendant_accounts(parent_id=org.roots[0].id)
    ```
    :param str parent_id: The parent ID of the accounts.
    """
    ...