D'alemberte contracts with elias to render personal nursing services for the benefit of federica. this is

D'alemberte contracts with Elias to render personal nursing services for the benefit of Federica. This is an example of a third party beneficiary contract. 

D'alemberte is a third party working to facilitate services between Elias and Federica. A third party beneficiary contract is still a legal contract and the third party can sue in regards to it even though they aren't the main two companies/organizations/people involved in aspects of the contract.