Casual stars Michaela Watkins and Tommy Dewey as Valerie and Alex, two adult siblings and Tara Lynne Barr as Valarie's daughter. All three actors are excellent in their respective roles and the writing is top notch. What I think is throwing some off, myself included, is the fact that the characters are not that nice. They are selfish, sometimes arrogant, and superficial, but along the way, we learn to forgive them because they are so damaged. Explanation of plot and characters would be irrelevant as it is a multi story-line arc, so just watch the show.
