<p>President Obama is caught smack in the middle of a family feud among 9/11 relatives of a financier killed at Ground Zero, The Post has learned.</p>
<p>The brothers of Adam Arias went ballistic when they learned that their aunt, Valerie Lucznikowska, was among the 9/11 relatives invited to last week's White House meeting with Obama. The brothers were not invited.</p>