<P> After Nellie graduated from school, her mother, Harriet, bestowed her with a restaurant and hotel . At first, Nellie balked, showing great incompetence in the hospitality business . Eventually, Nels and Harriet hired Percival Dalton (played by Steve Tracy) to help Nellie learn how to cook and run the restaurant . During this time, Nellie began maturing--thanks to Percy's work with her and Nels's values winning out over Harriet's--and fell in love with Percival . The two eventually married, and Nellie gave birth to twin children (Benjamin and Jennifer). </P> <P> Nellie became a close friend of Laura's in her adult years and Laura attended her wedding . Before Nellie takes off for her honeymoon, she throws the bouquet to Laura . In the episode "Come Let us Reason Together", Laura's mother Caroline helped deliver Nellie's twin babies . </P> <P> Arngrim left the series at the end of the seventh season . Nellie's resulting departure was explained by having her move with Percival and their twins to New York to run the family business when Percy's father falls ill; the move is made permanent when Percival's father dies . After Nellie's departure became permanent, the Olesons adopted a daughter named Nancy (played by Allison Balson), who bore a striking resemblance to Nellie, although she had a nastier and meaner disposition than Nellie . Nellie--who retained her pleasant personality seen in her later years--returned in the ninth season and met Nancy, who briefly ran away from home when she (mistakenly) believed that her adoptive parents loved Nellie more than her . When Nellie first meets Nancy and see how she acts, she asks her parents in shock: "I know I was temperamental at her age, but I wasn't THAT bad...Was I?" They all start to laugh, then they realize she was as bad . </P> <P> Compared to the book On the Banks of Plum Creek, the series presented Nellie Oleson as a much more prominent character . In the books, Nellie's family members are very minor characters, whereas the Olesons became major figures on the series, with several episodes focusing on Nellie or her family . Eventually, the "villainous duo" of mother Harriet and daughter Nellie proved to be very popular with viewers for their often evil, yet humorous, antics . </P>

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