My neighbor does odd jobs for me such as taking out the trash, cleaning out the gutters, etc. They fell off a ladder and required medical attention. Recently, they received a letter from their insurance provider that states:



> 
> If another person or entity caused or may be responsible for the
>  injury/illness treated, we have processed the claim in accordance with
>  your contract benefits. However, we may be able to recover the expense
>  of these services from the party causing the injury. Before we can
>  close this matter, we require additional information from you.
> 
> 
> 


Are they obligated to respond? If so, how should they respond?



Liability for neighbor injured on my property