Anyone else ridiculously happy that ME A will be a Ryder family affair?

you've never played SP? 

Ah.  While I still loved MP I think I got 7 pts into ME 3 SP.

You know it just occured to me, don't know what this means for the plot but it does occur to me that with three Hyperion ships, and three Ryders...this does present a possibility. That Daddy Ryder is important in the expedition and is able to parlay his importance to getting the rest of his family on the missions. He goes in Hyperion 1, which arrives first, and then one Ryder goes in Hyperion 2 (likely the Ryder who is not the protagonist) and then Hyperion 3 contains the protagonist Ryder.

That would one weird population distribution, but can't say it's impossible.

 Not even if the only way for them to die is for us to (choose to) kill them ourselves? 

Uncertain at this point. Hopefully the relationships between the 3 won't be predefined like rival-Carver and friend-Bethany were. I want to be the one to decide if we get along or butt heads.

BW used greek mythology for the Arks and if they follow the story of it, there are going to be 12 Arks in total. And it would make sense. First of all, because they would try to save as many as possible and because in the mythology it's about a God named Helios, too. (They are in the Helioscluster. You couldn't make it more obvious) I guess, they used a lot of it, so why not the number of Arks too?


And about the fear, that we won't spend so much time with our sibling and will be 'forced' to feel a connection with them... I can think of so many other games, in which this worked. For example The Last Of Us. You are like 30 minutes in the game with Sarah and lose her. I didn't know her well but I cried my eyes out. 
Or even in Mass Effect 3, the little kid at the beginning. We had one conversation with him, you can't even call it conversation because it was pretty much one sided. But his death was shocking none the less. And Shepard had nightmares about him, which was understandable. So it really depends HOW BioWare does it. But I'm really sure they can make it. They said they learned from their past mistakes and I believe so.

Can't say I've noticed much interactivity in their personality change, but I agree that brainwashing everyone looks silly in non-fantasy setting.

Depends on how is done. I certainly don't want to be the main plot of the game but more like a important side-story within the main plotline. I really don't want to be entangled in daddy-issues of my protagonist and his/her sibling.

Depends how it's implemented for me.
I really liked how Carver/Bethany were handled in DA2, in that player got to shape the relationship to some degree via the friendship/rivalry mechanic. The relationship with the mother was too static for my liking.

Which feature do you mean? The sibling or the different experiences? 
If you mean the sibling, that isn't true. If you chose to be a Spacer in the trilogy, you had a mother and the only interaction you had with her, were E-mails and 1 or 2 Videochats through all 3 games. So same could be in ME:A.