Even if they were, what kind of grandparent writes a letter like this to her grandchildren? (I think this might be somewhere on the blog, but I would have posted this and I had forgotten it!)
As I have observed, you always have had more than enough clothes, all the electronic gadgetry that was available, unlimited movies/videos and gaming programs. This was true despite the fact that your Dad couldn't meet the monetary needs of his family and that your Mom lost her employment as thousands of others have during this serious economic downturn. When people can't afford things, they have to understand they can't and act accordingly. You have to face the facts that there is no goose laying golden eggs to underwrite your expenses in life.