Truthful Lies, why be so full of hate (whether you personally or this couple)? So you die and head for heaven. The good Lord thinks about the prayer he taught us - "forgive us our trespasses as we forgive those who trespass against us". He takes a look at your will and how vindictive it is. He thinks, "This person's dying act was to be spiteful and unforgiving. No way they can expect forgiveness from me."
I think it is sad to use your last will and testament as a way of evening up scores. How much nicer it would be to use it as a way of healing wounds.
I speak as someone who has been on the receiving end of this. Me, my brothers and sisters were cut out of our grandfather's will. Why? We never did him any harm. The reason is, I think, he resented the fact my late father (his son) did not stay in the factory like him but educated himself and got a better job.
I don't care about the money (since his will was invalid for other reasons, it turns out we are entitled to our share anyway, but I don't really want it, knowing he did not want us to have any). I don't even feel angry or resentful towards him. I just feel sad that he thought he could use his will to "get his own back" as it makes it difficult to remember my grandfather with the fondness I felt towards him while he was alive.