Question: How many millions of people watched the episode "The Grandfather"?
SQL: SELECT "U.S. viewers (in millions)" FROM "1-26748252-1" WHERE "Title" = '"The Grandfather"';

Question: How many people wrote the episode with 3.40 million U.S viewers?
SQL: SELECT COUNT("Written by") FROM "1-26748252-1" WHERE "U.S. viewers (in millions)" = '3.40';