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MissPhiladelphia
After Kaitlin and John's parents passed away, both of them will inherit their parent's estate because they live in a society with a bilineal system. In this kind of system, the right of inheritance is passed equally to both maternal and paternal lineages. The right to inherit is exclusive to the kin of the deceased.
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Bilineal system is a arrangement of family heredity in which the lineages on the mother's side and father's side are equally significant for responsive connections or for transmission of possessions or affluence. Therefore both Kaitlin and John will equally inherit their parents' estate.