Sorry to hear about your family being affected by MS. I suppose I could have used better words and I certainly am not a Jeff Bezos fan boy, but I've just never understood criticizing others for what they do with their money.
Lots of people give to others without expecting a single bit of publicity. I wouldn't doubt that being the case with many celebrities.
I pay federal income taxes too. Do a google search for Jeff Bezo's income tax rate and all you get is articles talking about Amazon not paying federal income tax.
Do a search for Jeff Bezo's charitable giving and you find out that he is one of the top two philanthropists in the world, totaling over $2 billion dollars in donations.
Guess what? Charitable donations are tax deductible. When you give that much money, you usually don't have much of a federal income tax bill.
Personally, if I was in his position I would rather give my hard earned money to charities than the government as well. But lets keep saying he only gave 20 cents to one of many charities he supports.