Alexis "Lex" Murphy was John Hammond's granddaughter and Tim's sister.  

Lex Murphy
Vital statistics
Title "Computer Hacker"
Gender Female
Race Human
Faction N/A
Health N/A
Level N/A
Status Alive
Location N/A

Jurassic Park (1990 Novel)

Alexis Murphy is first seen in the novel coming out of helicopter with her brother. 

Jurassic Park (1993 Film)

The Lost World

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