What kind of horrendous parents do this? I can maybe accept that two people born on the same day may want to separate their celebrations, but having the celebration of one of twins two entire weeks before the other is quite simply hard to understand. It's like they go out of their way to put a wedge in your relationship, like they don't want you to see each other as the closest siblings possible. Not to mention the extreme difference in how you're treated. What does your grandparents think of this, do they know?

Your parents will live to regret this, when you leave them in the dust behind you.