It must be 20 years since I read a Joanna Trollope. I never particularly liked her writing. I recently picked this up in the library and am really enjoying it.
Perhaps it's because I'm now middle aged and the mother of sons, albeit not a MIL hopefully for some years yet. The central character here is used to a lifetime of being in control and number one in her sons' affections. She finds it painful that their wives now come first and handles it badly.
One comment by the daughter in law Charlotte was particularly stinging. The wife's mother always comes first before the husband's mother.