Maybe the brother likes them because they have childhood and child's bodies, and he never had either?
I don't know, I just don't want to the brother to be two-faced or manipulative. The twins never had a place to belong or where people being friendly. Apparently all royal maids are shit, huh.
I actually hope that the red-hair is the f8x in the cover also, and maybe become the twins personal escort? They seriously need someone, who they genuinly can trust.