Name the number in series for in the ward family and the wren family
CREATE TABLE "table1_19897294_8" (
  "no_overall" text,
  "no_in_series" real,
  "family_families" text,
  "location_s" text,
  "original_air_date" text
);
SELECT MAX("no_in_series") FROM "table1_19897294_8" WHERE "family_families"='The Ward Family and The Wren Family';