SOLDJust represented both Buyer and Seller in the Sale/Purchase of 1427-1443 E Prospect (1 acre), east and adjacent to Santorini Greek Kitchen.

You need to ask to see the documentation that enables your seller to pass marketable title.An an informal (summary) probate, you would entitle the seller as Mary Smith, personal representative of the estate of William Smith, deceased.If a formal probate, they will vest as "Mary Smith, Administrator of the estate of William Smith, deceased."

I'll also contact Sean Richway and see which company he represents.

The Cleveland market is very well represented on this site.  

They both represent significant risk and I will avoid both risks. 

Michael Conway I represent several large hedge funds and many private investors that spend under 50,000 in Memphis and we have ROI's in the mid-teens every year and I can show you actual results.I'm a fan of that exact price range for several reasons!

How do I talk to a seller if he is represented by a broker and the latter dismisses my low ball offer regardless of how I arrived to it?

All of that being said, I would make sure that you have a aggressive and knowledgable agent that can represent you very well.  

The attorney's name is near the top and the representative's name and address is listed at the bottom of the General Information page.

Maybe find some pics that represent what you are planning on building and see if you get a response.