Adelphia Says Rigas Family Owes \$3.23 Bln  NEW YORK (Reuters) - Adelphia Communications Corp.  &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=ADELQ.PK target=/stocks/quickinfo/fullquote"&gt;ADELQ.PK&lt;/A&gt; asked a U.S. bankruptcy court to order its founding  Rigas family to pay back \$3.23 billion it says the family owes  the company, court papers show.