Since looking into it a bit more, I've found out if Elizabeth stayed faithful to Will for the 10 years he was absent, his curse would be broken. Needless to say, I'm not going with that.

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"Harry, you've heard of the legends of Davy Jones, yes?" Andromeda said.

"Yeah.."

"Well one of the things magicals know that muggles don't, is that at some point in the 1700's, Jones was replaced by someone else. Someone called William," she moved her finger to the name at the top of the tree, "who was married to Elizabeth," she moved her finger to the name next to the first, connected by a double line, "hours before he was mortally wounded by Jones, and only lived to sire a son," again her finger moved, to the name below theirs, "because his wife and a family friend helped him stab Jones' heart, making him the new captain of the Flying Dutchman. Harry, if this is right, which I rather think it is, you're the descendant of The Lord of the Deep, which means the Call will be incredibly strong in you, you'll be called to the sea four ways, the Black's Call, the Lord's blood, which before his promotion was Pirate blood, and the call of Kin, which will draw you to the last of the direct family you have. Even if we can barter the Sirens down to a fair price to temporarily lessen the Black's Call, it may not be enough."

Harry's face set in an expression that, had Hermione seen it, would have made her hit the books. It was his 'I'll find a way to keep my word if it rips me apart and shatters the sun, I will keep my word.' expression, and when he got it, it was pointless to argue, the best you could do is buckle down and search for a solution, before Harry had to make one.

The Director, probably recognising the look, spoke up. "If I may offer my advice, don't change the plans just yet. I can send an envoy to Captain Turner at the same time as the Sirens, if not before, and if we are very lucky, Mr Potter's status being what it is as well as what we suspect, it would greatly help our bartering. Look for the house and make other plans just the same, the only difference is now we shall be waiting on two messages not one."

After that statement, the four went back to looking through papers, discovering more properties in various states of repair in the Caribbean, a fishing vessel in Singapore, and a few small islands, some reclaimed by the sea, and others, including one called Rumrunner's Isle, that have in fact gotten larger. Harry's list of media-bestowed nicknames was bad enough, but his list of actual titles was ridiculous.

Governor of Rumrunner's Isle, Crossbones Key, Isla de Muerta and an unnamed island said to contain the remains of Ponce de Léon's ship and the destroyed Fountain of Youth

Chief of the Pelegostos

King of the Merfolk

Commodore Potter-Black

Pirate Lord of the Caribbean Sea

Captain Potter-Black

Lord Potter

Lord Black

Master of Death (despite 'losing' the Stone and snapping the Wand, when he woke the next day, both were laid carefully atop his pile of clothes, and the Cloak folded next to it. Any further attempts to accidentally-on-purpose lose or destroy them, resulted in them reappearing at unfortunate times, so he gave in and just keeps them on him, along with several other vital items, in the mokeskin pouch Hagrid had given him. The war had drilled 'Be prepared' into his skull permanently)

His possible titles were quite a lofty list too:

Heir to the Deep (also called 'Sea' or 'Locker')

Pirate Prince (if not King)

Pirate Lord of the South China Sea

And owner of multiple properties, lands and islands owned by the Turner family before they absorbed into the Potters.

"No wonder the purebloods have such big heads." Harry muttered. He then saw the others' faces. "Most. No wonder most purebloods have big heads." He amended.

"A few of these are merely honorary, the 'king of the Merfolk' simply means you won't personally be attacked by them, it doesn't mean you rule them and won't stop them attacking a ship you're on if the fancy takes them." Here Harry interrupted the Director.

"Is that all Merfolk, or just the sea ones?"

"All of them. If you're thinking of your experiences in the Second Task, that is why they didn't attack you after you broke the Task rules, and what saved your life after you drew your wand on them. You're very lucky Murcus is the Chieftainess, any other might not have understood your actions. They also saved your life when the Gillyweed wore off, pushing you to the surface. The 'Chief of the Pelegostos' is fortunately irrelevant, as they were a cannibal tribe that has since died off or been wiped out. The Isla de Muerta was full of treasures from pirates including a cursed chest given to Cortez by the Aztecs, and is underwater, with all of the treasure bar the cursed chest in a Caribbean branch vault. The rest of the titles you don't need to worry about until your 30th birthday. The possible titles from the Turners will need confirmation from Captain Turner, so again aren't anything to worry about yet." With that, the discussion of the sea chests ended, and talk returned to cursed items in the Vaults and what to do with them, as little Teddy burbled away happily in the corner...