A Special Gift
When you have a sibling who is exceptionally talented and skilled in a craft, you may find that you experience feelings of intense jealousy when that sibling gives their creations to other people. You seem to believe that just because you are the sibling, you are entitled to at least a small portion of a family discount, and this is true regardless of whether or not those other people are paying for it.
This individual believes that the discount should be offered, but they will not, under any circumstances, give away their talent for free. That is something that we would agree with, and we believe that the other person is being extremely self-centered in their request for something that requires so much effort for nothing in return.