WASHINGTON (AP) — 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.

At the same time, the justices also signaled in arguments lasting two and a half hours that they are wary of Google's claims that a 1996 law, Section 230 of the Communications Decency Act, affords it, Twitter, Facebook and other companies far-reaching immunity from lawsuits over their targeted recommendations of videos, documents and...