A chaotic beginning This pilot episode spends a good deal of time familiarizing us with six characters that it appears to be setting up as the show's regular cast - but by the end of this 90-minute first episode, three of those six would be gone.
However, they were NOT a father, mother and sister as another review here stated. One was the father of a character who remained in the cast - but the other two were graduate students, not relatives.
Those three would be replaced over the next two episodes by a pair of more interesting and colorful characters - a woman from the future and a man from the recent past - in an effort to have a more diverse group of personalities in the cast.,