I have only read the first page. The Step Grandma was rude, unkind and in my opinion extremely ill mannered.
It is lovely when a charming, polite and kind person says please and thank you. Adult or child.
Some of the rudest, most unkind children and people I have ever met have always said please and thank you. Some of the kindest, nicest children and people don't always say it.
Manners are in the countenance, the tone, the helpfulness, the willingness, the kind word, the nice gesture, the compliance, the sharing - the words count for little without any of that.
Yes, I did bring up mine to say please and thank you. Only yesterday DS asked for something at the table "pass the salad mum" and I responded "pass the salad ...................." and he duly broke into a full beam and said "please mummy". He got in from clubbing with his girl friend about two hours ago.
They made hot drinks and offered me one - that's what I call good manners. They were amiable and polite but I'm not sure his girl friend actually said "hello Mrs Belle, thank you so much for letting me stay today". Do I care, of course I dont', I'm just jolly glad they are home in one piece and I can say to dg, "if you're so cold and wet, why don't you run yourself a nice a warm bath"
I just asked dd if she'd like me to make her egg and bacon. She answered "yes please" very nicely. Phew - she came in very squiffy last night but is still my lovely daughter.
This parenting business is about more than teaching them please and thank you; just as this life business is about more than saying it like a dolly with a string in it's back - the really well mannered mean it too.