I too was a schoolboy in the 1950s (on the other side of the globe) so I enjoyed his enjoyment of boyish escapades. A sympathetic style from a sympathetic author. I did find his writing at times a little staccato. He has plenty of dialogue which is great, but a bit one-paced.
And, perhaps most oddly, he does not sense when there is an incident of greater tension or excitement, that needed slightly different treatment. He is so relaxed about the murder of a taxi driver, it is almost disconcerting. And then there is a wonderful description of scout camp, and the cooking of a complete stew inside a hollowed out pumpkin laid on the embers of the camp fire: that deserved so much more than its single paragraph. I wanted the recipe!
It was the title that first grabbed me, and I certainly warmed to a fine elderly lady, with a warm sense of how she has been blessed; a worthy matriarch. But I agree with Sharon: it is the detail that can give colour and interest, and should not be despised.
Most disconcerting is the fact that she is writing for her grand-children and their children (nothing wrong with that), but with such sentences as 'You know the rest of the story' and the inclusion of photographs of family members, I felt as though I was intruding on a private, family text. Oops, my apologies for inadvertently eves-dropping.