Tired Ladies Take a Stand by Gretchen Anthony

 Fern (a writer), Emma (a teacher), Carolina (a corporate mogul), and Andi (a lawyer) have been best friends for decades. When we join them, Emma's beloved daughter, Portia, is getting married and she's trying to make the perfect wedding despite Portia's future mother in law's passive-aggressive demands and the fact that Emma is still recovering from getting dumped by her longtime husband for a blonder and younger model. Andi's teenage son is acting up and she thinks she may have to cut back on work and work travel to get his life back on track. Carolina is worried about layoffs affecting the group she leads at work. And Fern is trying to figure out how to tell her best buds that the book she wrote years earlier about their youthful misadventures may be turned into a movie--which she knows not everyone will be in favor of.

We watch these stories unfold in real time peppered with flashbacks to their earlier adventures. And we learn that the girls have been carrying a big secret for Emma that may soon explode, involving one of her (very nasty) exes. We don't find out what that's all about till the very end.

I thought it was interesting that Portia's bridesmaids all wanted to have long-term friendships like Emma and her friends have, but Andi notices that the teenage girls in her son's circle spend most of their time on their phones and she wonders how they will ever develop lifelong friendships.