I'm not going to decrease the price just because my cousin is helpful.
How is your cousin helpful to you?
He pays for my wife and I's vacation. We used to all go together.
Not lowering the price of vacation tickets for your cousin doesn't show gratitude for his offer to pay. Lower the price that you are telling him to the price that the tickets actually cost.
I can't roll back my price just because he's asking to much just because of the favors he has done.
If you don't show how much you appreciate the favors he does, then he might stop doing you favors.