Re: Rishta got broken one week before the wedding.
No zobia .. its because he is catholic and she is LDS (I am not sure what that means) christian.
Meethishona, in this scenario your father is at fault. it is clear that religious difference was not the issue as both parties were aware of that from beginning, it was religious ceremony (choice of church) that became an issue .. and even in choosing the church, your ex-inlaws were right as everyone would pick their own if arrangement is upto them (just a matter of convenience).
Now what can you do? I am not sure. Talk to them maybe or have an elder of your family talk to your dad