I just finished reading Matriarch: Queen Mary and the House of Windsor
It is very well written, and I do recommend it. (So far, anyway.) But what strikes me is the notion that with royal biographies (and presumably others) there is a bias towards the subject. Queen Mary is viewed as the perfect royal, albeit maybe a little unfamiliar with her own children. Queen Alexandra, on the other hand, is viewed as not the perfect royal – and too close to her own children, and loving and caring towards her grandchildren.
An interesting contrast.