Real Life & Liars, by Kristina Riggle

Max and Mira are about to celebrate their 35th wedding anniversary and all three of their children come home for the party, but the first thing we learn about Mira is that she still smokes pot at 65. Then we find out she's just been diagnosed with breast cancer. Mira is a wonderfully drawn character, very much her own self. The author tells the story from different viewpoints so we get to know all the members of the family. For a first novel, this really stands out.