[MuzikalNotes]

Originally Posted by Jan-Poo

Lol this is an interesting theory but i doubt it's true. I did notice the grandson part, but soon afterwards i think she then said "the oldest grandson". Anyway

Spoiler for Episode 3:

If Battler didn't exist then the red truth isn't true because battler was mentioned.

Eva was with you (Battler) the whole time. So committing a crime was impossible for her
Of course, Battler-kun isn't the culprit

How could Eva be with Battler if Battler doesn't exist?

yet again if Battler existed but was no longer a family member he'd be never placed before Natsuhi Hideyoshi and Kyrie.

Anyway i don't think they would leave an empty seat for the missing family members, Kinzo's seat is an exception because that's only meant for the head of the family. Also Maria's father doesn't count as family member since he never married Rosa. To be a family member one must have "Ushiromiya" as surname, Rosa would lose her rank if she married, unless she does exactly as Eva did.

Spoiler for Battler:

What I got from that was that wasn't the real Battler, since he hadn't seen his family for 6 years, so he might be someone else disguised as Battler. While we should always take the red text with a grain of salt, if we consider that line, maybe that person also has the name Battler (very unlikely, though; even foreigners don't have that kind of name), or Beatrice herself doesn't know it.
Thing is, maybe the red text is what Beatrice thinks is the truth, since truth is a very general subject. For example, there's an accident, and two witnesses have different stories of what happened. Unless there is some proof that one of those stories is wrong, in their minds, they think they're right, when they might be wrong (after thousands of hours of investigation or evidence from some omni-narrator).
Maybe I'm thinking too much...