Eren manipulates Grisha in Japanese sub using English letters/ romaji

Yeager family, Attack on Titan Wiki

How did Eren communicate with Grisha? - Quora

Grisha: The Story of Cellist Gregor by M. Bartley

Why did Grisha Yaeger scream out 'Is this what you want Eren' after killing the Reiss family? Was Eren controlling him? If so, how and why? - Quora

Grisha Yeager/Gallery, Villains Wiki

Worst parent figures and their children : r/attackontitan

Why does Eren mention his father being eaten? What possible reason does Eren want to show Zeke such a fucked up scene?? : r/titanfolk

Eren's actions of manipulating Grisha and 'killing' Carla share the same goal. : r/ANRime

How could eren manipulate grisha? I mean he was just seeing grisha's memories, wasn't he? Then how could that happen? (He was not even using founder's powers, zeke had control over that)

Zeke Yeager, Attack on Titan Wiki