People have babies the day of a siblings wedding. People have non-elective surgery scheduled for the day a sibling graduates from college. People take the bar exam ( a requirement for starting their job as a lawyer) and have to miss a siblings major life cycle event.
This happens frequently in families and everyone works it out somehow. Avoiding conflicting graduations is a very weak reason for transferring. And what if one of you ends up delaying graduation for a semester due to circumstances beyond your control and the notion of being on stage together goes out the window despite the transfer???