CREATE TABLE table_27502 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT)

What episode number in the series is 'tough love'?
SELECT MAX("No. in series") FROM table_27502 WHERE "Title" = 'Tough Love'
SELECT MAX("No. in series") FROM "table_27502" WHERE "Title" = 'Tough Love'