The fatal crash took place near Zinkwazi in KwaZula-Natal province, South Africa, after a Mercedes reportedly hit their car.
Tabitha died at the scene while mum of two Louise passed later on, Daily Star reports.
The driver of the Mercedes, a 60-year-old female, also reportedly died at the scene.
Louise’s husband Alistair and the pair’s 11-year-old son Benjamin remain in hospital in a critical but stable condition.
It is believed that the family were all wearing seat belts during their drive.
The Queen’s cousin, Lady Helen Taylor, who missed out on a spot at Prince Harry's wedding to Meghan Markle, is married to Louise’s older brother Tim Taylor, 55, marking the tragic family’s relationship to the Royal family.
Lady Helen, a former fashion ambassador to Giorgio Armani, is 40th in line to the throne.
Her husband, Tim, is an art dealer who runs a gallery opposite Connaught Hotel near Hyde Park.
Commenting on the tragedy, the Foreign office said: “We’re assisting next of kin of a family in a road accident in South Africa."
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