Conversational reverse shot of Cain's brother, Abel the shepherd, who looks as if he had a different mother. Since there aren't many people in his past who he can resemble (it wasn't so long ago his family was kicked out of エデン, seventh scandal this year), he is forced to resemble people in the future. Skipping across Fibonacci-generations, until the resemblance finally lands in your family. And if that is true with Cain, it is true with Abel. Both would/could/will/did come from your 家.