Wiktionary
blood royal
n. A member of a Royal House or dynasty who has at least one parent who was born into that particular house or bloodline.
Usage examples of "blood royal".
From this moment you are His Highness Prince Carl Gustaf, blood royal and Lord's anointed.
He was indeed all spattered with the blood royal, but what had fallen on me was a bead of sweat from his brow.
Now Naja is of the blood royal, and Nefer is stripped of even that protection.
These messengers have no idea that this is a prince of the blood royal.
Although it was common practice among the blood royal to marry their heirs off young, he looked like such a lad, standing there in his dirty clothes, that it was hard to believe him married.
It's a race to see who gives her an heir of the blood royal first.