WASHINGTON — In its first case about the federal law that is credited with helping create the modern internet, the Supreme Court seemed unlikely Tuesday to side with a family wanting to hold Google liable for the death of their daughter in a terrorist attack.In two and a half hours of arguments, the justices seemed concerned about upending the internet in their interpretation of a 1996 law, Section 230 of the Communications Decency Act, that shields Google, Twitter, Facebook and other companies from lawsuits over …