Carla: "I've said this a million times already Eren! There is no way I'm letting you join the damn Survey Corps!"

You had snitched on Eren, your brother, telling Carla that he wanted to join the Survey Corps. So now, Eren was stuck listening to Carla, your mother go on and on about how the Survey Corps wasn't an option because she didn't want him to die.

Grisha, your father was encouraging Eren's ambition unlike Carla, his eyes speaking words that he couldn't actually speak with his mouth.