Mariska Lutz, who appears to be of Eastern European origin, and her husband Sam were likely among the working class of Rapture. While in the city, they had a daughter together and named her Masha. Masha knew nothing of life above the surface. Masha was taken from them by Frank Fontaine, telling them she could help save the failing city.
Mariska and Sam's worst fears were confirmed when they saw first hand that Masha had become a Little Sister. In their despair, they committed suicide via an overdose of pills in their room in Neptune's Bounty.