Advice on performing due diligence.

[Tonya Lutz]

I'm in need of professional brainstorming.

I'm trying to anticipate anything going wrong with this 'sale of house' scenario: I was named the executor of my Mom's trust, specifically because my Mom said she didn't trust my only sibling. My sibling moved in to take care of her. Unexpectedly, she cancelled my executor-ship and moved me into the category of beneficiary only and gave full control, medical & executor functions, to my sibling.  I had taken the executor's duties seriously and had educated myself, reading books on how to handle this end of life transition.  I am left with one question:

If my sibling 'has a guy' they told me they were going to use for the sale of her house, what potential ways are there that can lead to the proceeds from the sale of the house not being divided equally? The house was not assessed by an impartial third party at time of death. I had requested it. As of today, I don't believe that it has been done and he still wishes to use the 'guy' he knows. I have been suggesting that the seller be someone we don't know.

April 3rd is the date where he has to disclose the asset list with valuations.

For context, he has a genius IQ, so he may be more knowledgeable than I, which is why I'm asking for a real estate professional's advice. I'd like to preserve our tentative amicability, without just giving in to his methods. Our relationship was non-extant and I was not on speaking terms for 8 years before the passing of my Mom. I realize a relationship is built on trust.  I don't want any of my sibling's actions to jeopardize our verbal no-harm agreement while we get through this transition.

I realize I'm asking for free help, but I'd be extremely grateful for any scenarios that can help me spot warning signs and correct if it's within my legal rights. Thanks, Tonya