In Fantastic Beasts And Where To Find Them, when Tina disarms Graves,
does she then become the owner of the Elder Wand?
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In the promotional picture for the next movie in the series, Fantastic Beasts: The Crimes of Grindelwald, Grindelwald is seen holding the Elder Wand.
This doesn’t show whether he’s the master of the Elder Wand, but it shows that he has the Elder Wand. That he has it is referenced on Pottermore, in one of their pieces giving information on the next movie.
Grindelwald has the Elder Wand
In this new photo, Grindelwald is seen holding the familiar, textured wand we recognise from the Harry Potter films. From the books, we know that Grindelwald stole the most powerful wand in the wizarding world from the wandmaker Gregorovitch quite early on in his reign of terror.
Everything we know about Fantastic Beasts: The Crimes of Grindelwald so far, Pottermore
He’s also seen holding it in the second trailer released for Fantastic Beasts: The Crimes of Grindelwald, which is referenced in a news release on Pottermore.
Grindelwald has the Elder Wand
Well, that settles that. The Elder Wand, one of the three Deathly Hallows, is definitely in Grindelwald’s possession during the events of this movie. There is simply no mistaking its recognisable berry-esque carvings that we remember oh-so-well from the Harry Potter films.
As far as we know, the next person to take the wand was Dumbledore after their famous 1945 duel. The Crimes of Grindelwald is set in the 1920s so... blimey, does that mean Grindelwald owns the wand for at least two decades? That doesn’t sound like a fun two decades, if so.
- Everything we noticed from the Fantastic Beasts: The Crimes of Grindelwald Comic-Con trailer (Pottermore)
So, at the time of Fantastic Beasts and Where to Find Them, Grindelwald physically possessed the Elder Wand and seems to be using it as his own, though we don’t know yet if he’s its true master.
It’s unlikely that Tina would have changed the Elder Wand’s mastery, since she didn’t “win” over Grindelwald. Grindelwald dropped the wand he had been using, and Tina summoned it away. She neither Disarmed him using Expelliarmus, nor did she wrestle the wand from his hand.
“With a sense that he’s been holding this one back, he slashes it through the air: out flies a crackling rope of supernatural light that wraps itself around GRAVES like a whip. GRAVES tries to hold it off as it tightens but staggers, struggles and falls to his knees, dropping his wand.
- Fantastic Beasts and Where to Find Them: The Original Screenplay
Grindelwald likely would have had mastered the Elder Wand himself before his encounter with Newt and Tina, so if he did, the mastery of the wand would likely be with either him or Newt. To get the Elder Wand, Grindelwald had broken in, Stunned Gregorovitch, and stole the wand - Stunning him would likely count as defeating him.
Rowling has said in an interview that the identity of the current owner would be a spoiler, so we can probably assume Grindelwald doesn't have it during the events of the first film (him having it was already shown in the books ave thus wouldn't constitute a spoiler).
What happened to the Elder wand? Where is it? The elusive Elder wand.
JK Rowling: Where is it right now?
JK Rowling: I can't tell you, but you will find out in movie two
(Snitchseeker interviews JK Rowling - Fantastic Beasts premiere)
As shown by the promotional material cited in Bellatrix's answer, Grindelwald likely acquires it at some point during the second movie, but we really don't know who has it before that point.