At two years and eight months, they live in Cardiff, having moved with their father, Ibrahima Ndiaye, 50, from their birth place of Senegal.
It's been a journey of hardship, with the family swapping a prosperous existence for one of hostels and food banks.
The girls are now safe, but a shadow looms.
Marieme's heart is weak - so weak, she may die.
If this happens, her stronger sister Ndeye will die with her.
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