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document everything.
call the realtor's broker YOURSELF.
explain the yelling incident to the broker as well.
And never ever again use a dual agent..
One thing, by estate sale, did the parents pass away?
If the people handling the estate sale have never lived there (or are the kids who have not lived there for a long time) proving prior knowledge could be difficult.
I hope the home inspector has pictures from his inspection because you may have to be able to prove that he was not the negligent one if in fact he did the inspection or prove that the damage is recent.