Definition - What does Primogeniture mean?
Primogeniture is the legal classification for the oldest child of the same two parents. It is a differentiation that exists for probate reasons in that the oldest child of two parents will be made executor of the will when possible.
Justipedia explains Primogeniture
The inheritance laws rely on primogeniture to determine the process within each probate. It is the first consideration and creates a situation that predetermines how the probate will proceed. It stabilizes the process when there are more than one benefactor.