While charitable donations can be earmarked for a specific purpose, I have never heard of a charitable donation that is earmarked to be given to a specific business, whether owned by one’s next of kin or not.
Never mind that this is disgustingly self-promoting behavior for anyone, let alone a multi-million-dollar Presidential family. I question whether it is even legal. I would like to see the IRS review this situation and say that it is okay for a charitable organization to be required to use a donation to purchase the product of a specific company. That just seems plain wrong.