Supernatural has proven to be an incredibly successful show for The CW (formerly known as The WB), with 15 seasons and 327 episodes to its name. The Winchester family has been at the heart of the series, with Dean and Sam Winchester as the main characters. As the show progressed, more family members were introduced, each playing a significant role in the overarching narrative. While not all Supernatural characters were a part of the Winchester family tree, characters like Ruby, Castiel, Crowley, Lucifer, and others still made significant contributions to the series.

However, the core family members were crucial to the show's plot. The series finale even introduced a new Winchester, bringing the total number of family members to eight. Henry Winchester, played by Gil McKinney, was Dean and Sam's grandfather in the show. He was a member of the Men of Letters, a secretive group dedicated to investigating supernatural mysteries. He married Millie, and together they had a son named John.

Millie Winchester, Dean and Sam's grandmother, was not a prominent character in the show and was rarely mentioned. However, in the prequel spinoff, The Winchesters, Bianca Kajlich portrayed her character.

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