Board Thread:Manga/@comment-5774380-20160908231942/@comment-27321453-20160920002730

CommonSwift wrote: or maybe his first wife died before he went to the walls

Good point. if the woman is his wife and she passed away before he went to the Walls, then Grisha wouldn't be cheating on her by marrying Carla.

But Zeke was still abandoned if he's indeed Grisha son which if you connect the dots of the recent chapters (Zeke reassuring himself not being like his father, his striking resemblence to Grisha and his surprised remark about Eren looking nothing like Grisha) I'd be shocked  if he wasn't. I mean Zeke can't be talking to himself about his father and then it's revealed he knew Grisha for them to be brothers. His daddy issues were mentioned for a reason, it's exactly why I believe Grisha and Zeke are father & son rather than brothers.