Final answer:
Upon the death of the eldest Mr. Darcy, his son, Fitzwilliam Darcy, inherited the Pemberley estate and took on family responsibilities in Jane Austen's 'Pride and Prejudice'.
Step-by-step explanation:
After the eldest Mr. Darcy's death, the estate, Pemberley, and the family's wealth were inherited by his son, Fitzwilliam Darcy, the main male protagonist in Jane Austen's novel Pride and Prejudice. This inheritance also came with the responsibility to care for his younger sister, Georgiana, and to maintain the estate as a fitting member of the British gentry. The ramifications of his inheritance and his status play a significant role in the novel, influencing his character and his relationships, especially with Elizabeth Bennet.