Alexander is the eldest son of
Thaddeus and
Alicia Pierce. He has one brother,
Nicholas, who is six minutes younger than him. This means Alexander is the smarter and wiser twin, because he will always have a six minute head start. Nicholas does not entirely agree with this assessment, unfortunately, and Alexander has learned not to speak of it, because it is much harder to get Nicholas to do what he wants him to do when his little brother is mad at him, but Alexander knows it is true.
Though Alexander was named for a great (the Great) military commander and conqueror, while Nicholas got named for the prominent alchemist and creator of the Philosopher's Stone, they were both born to a pair of Aladren Head Students who had run their school without any adult supervision for half a year, so Alexander figured, genetically, both twins were predisposed to both intelligence and leadership, and he thought higher of Nicholas than anyone else in the world - including Mother and Father - but Nicholas was still the little brother, and it was Alexander's duty to look out for him, and also tell him when he was being an idiot and what Alexander's *better* idea was.
He’s from the moderate sub-branch of the New Hampshire Pierces, which means he holds with most pureblood society ideals, except he knows gender bias against women being powerful members of society is just stupid, and he doesn’t think less of people with less than completely magical lineages (though it is certainly an advantage, if you do happen to come from a prominent family, and he has every intention of making use of that). His own Grandfather Bauer was a muggleborn, after all, though he doesn’t like to talk about that very much.