http://mcadams.posc.mu.edu/parnell/faq.htm(snip)
LHO's daughters, June and Rachael took the surname of their stepfather, Kenneth Porter, in 1965. This helped them to remain somewhat anonymous while growing up in Texas, although they still endured the stigma of being the offspring of the assassin of JFK.
According to a 1995 article, June keeps a low profile and works in business. She uses her married name (undisclosed) and tries to protect her own children from the controversy. She manages to keep a sense of humor and mentioned that she enjoyed the "second spitter" episode of Seinfeld, which parodies the Single Bullet theory.
A Texas Monthly article also from 1995, reported that Rachael worked for seven years as a waitress while putting herself through nursing school and went on to find employment in that field. She seemed to be the more conspiracy-oriented of the two girls and enjoyed meeting Oliver Stone during the making of his film JFK.
Marina Oswald, the wife of Lee Harvey, has changed her stance on the assassination several times over the years, often apparently due to influence by whatever current book or theory is popular. She currently believes that her husband was innocent. She still lives in Texas.
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As I recall, both June and Rachel were very young when their father killed JFK. (I'm not a conspiracy theorist, in that I believe Oswald did it and acted alone.)