Evandar

Gods, no. He wouldn't be prepared, would he?

My headcanon is more along the lines of this: if someone with the genetic predisposition towards necromancy is exposed to death at a young age, it triggers a change in their magic that leads them to become a necromancer. (A bit like how you see Thestrals.) So all of the Peverell brothers have the gene, but only Ignotus is one because his mother died in childbirth. He was then exposed to the catastrophe that was the Black Death, which also counted. That triggered him and not his brothers because they hadn't been exposed to their mother's magic as she died, while he had and it takes more than one incident.

That gene is passed down through him to the Potters and to the Gaunts. For me, Cadmus died childless and Ignotus, who was there, took the ring back. He gave it to his daughter when she married just like he gave the cloak to his son.

Voldemort dabbles in necromancy (inferi, Horcruxes) but beyond that, he doesn't bother with it much because a) he fears death, and b) necromancy has the reputation for being useless because not everyone can perform it. Harry, on the other hand, has survived two Killing Curses and a near-death experience with Basilisk venom. He's got the same predisposition as Voldemort, but... No one on his side would be quite as accepting. Necromancy is a Dark Art and everyone is paranoid.

Cue breakdown.

But. Pretty much anything goes here. There's shockingly little to work with because of a lack of development - even the wizards think that they're nothing more than myth and rumour.