Invisible members of the family. Not like real brothers and sisters. You know what those are like, no such thing as a half or a whole. They are always there, even when they are not. No, these siblings are unheard and unseen and unclaimed. Still there since you can remember - although you would've call them something else at that time - you know they cannot be your invention. They must have belonged to someone, been someone's responsibility. And yet they are clearly uncared for. Your mistake, or maybe not, was realizing that you were related. You can't go back from that. You can't unrelate yourself. Believe me, I've tried.
So now you need to listen, you have to see. And while they don't talk about you, they do.
You're back in 5th grade, it's your first dissection. But now you are the frog. You are both horrified and fascinated as you watch the scalpel open you up. You observe and realize that even observation is participation.