I agree, bring back the tear-inducing cute animals from years gone by.
About the shaking-the-cards-for-money-thing, though, I read it not as the kids looking for cash they wanted because they were bratty, but expecting cash because previous years Grandma has given them that/shown that she doesn't put thought into presents? They didn't expect anything else/were confused there wasn't cash in the card like usual?
It wasn't well executed to be honest. Parents characters completely missed the mark, which in turn made the children look like brats, when I think they were supposed to be wanting attention that Grandma couldn't give until John Lewis helped her see the light!
And I dont know why the daughter was surprised her children were bored. She presumably grew up in that house/with her mother who didnt know how to relate to kids, so surely she should have expected this was how the visit would go.