I Am Paying for a Used Car for My Youngest Brother

I told my parents that I would chip in to buy a used car for my youngest brother. He had done very well in his SATs and I could not think of anything to buy him. He is such a good boy that if I asked what would he like, he would say that donating to the charity would be a great idea. As a family, we have been donating to a charity every month as requested by my youngest brother. However, every one of us received a huge present for our accomplishment in our SATs. Out of my four siblings, I was the only one who asked for a car, while my other two siblings had asked for a vacation in a foreign country, and the other received a motorbike. Now, it is our youngest siblings turn and since my parents are getting him a used car, I thought it would be great to share the payment.