Problems sharing account

[N2none]

My brother-in-law and I are trying to share my uv collection with him. He currently already has an UVVU account and an account with vudu. I primarily use flixster but have a vudu account.

I added him and created a shared account for him in UVVU. How can he link the log in credentials that I created for him to his current account he has at vudu? It seems the only option he has is to remove his account at vudu not the ability to add the shared accounts info.

Does he have to create a new account with vudu in order to access my shared movies?

Additionally merging accounts is not an option. We only want to access the shared movies.

Thanks!