premise: Richard Linklater's daughter was in Boyhood.
hypothesis: Boyhood (film) . Richard Linklater 's daughter Lorelei plays Mason 's sister , Samantha . Lorelei Grace Linklater ( born May 29 , 1994 ) is an American actress . She is the daughter of Christina Harrison and director Richard Linklater . She appears in her father 's films Waking Life and Boyhood , the latter playing the older sister to Ellar Coltrane 's Mason .