Was Trixie Speed Racer's Sister?

No, Trixie was not Speed Racer's sister.

Trixie's Family Role in Speed Racer The Next Generation

Trixie Tredwell Racer holds a distinct familial role within the universe of Speed Racer The Next Generation. Her relationships are clearly defined within this continuity, establishing her as a core member of the Speed Racer family, but not as a sibling.

Her primary relationships are:

• Wife: Trixie is the wife of Speed Racer Sr.
• Mother: She is the mother to their two children, X and Speed Jr.

This information explicitly positions her as a spouse and a parent within the Speed Racer family, directly refuting the idea of her being a sister to either Speed Racer Sr. or Speed Jr. While Trixie's relationship with Speed Racer has been portrayed differently in various iterations, in the context of Speed Racer The Next Generation, she is definitively the matriarch of the family.

For a clearer understanding of her family connections:

This table illustrates that her role is foundational to the family unit as a partner and parent, rather than a sibling.