A comment pertaining to startup &quot;common sense&quot;: You clearly have no domain knowledge. How do you presume you could even identify whether there was a market opportunity, let alone contribute anything to any startup you might found? This is something some law firms in some specific countries might attempt.<p>Now regarding your question, your first stop should be a notary that deals in estate management, particularly somebody who deals with inheritance a lot. Through their job they come across all kinds of weird tax schemes regularly and would be up to date on the topic.