First, let's split hairs. Kayti Edwards is only Julie's granddaughter by marriage. Kayti's grandfather, famed director Blake Edwards, was married to the Sound of Music star from 1969 until his death in 2010, and Kayti's mother, Jennifer, is from Blake's first marriage to Patricia Edwards.
Other than her Hollywood parentage, Kayti's only real claim to fame is that she used to be a model and claims to have dated some famous guys, often when they were dating other people.