Marston daughter is the deceased daughter of John Marston and his wife, Abigail, and Jack Marston’s younger sister. She is briefly mentioned in the Bonnie MacFarlane mission "Women and Cattle", Nigel West Dickens mission "The Sport of Kings, and Liars", the Luisa Fortuna mission "Father Abraham", and indirectly in "The Gates of El Presidio" by Javier Escuella.
She is never seen in-game, nor can her grave be found. She is only mentioned in dialogue between John, Nigel, Bonnie, and Luisa. Her first name is never mentioned at any point and is unknown.
- It is unknown as to where she was buried, as there are no gravestones bearing her name at any of the cemeteries in Red Dead Redemption.
- She is never seen or mentioned in Red Dead Redemption 2.
- In the mission "Women and Cattle" John Marston mentions a gap of "years" between his time in the Van der Linde Gang and his daughter's death.