Nanakawaichan
Maybe he is that child, maybe not. All the clues point to the MC be this hidden child. If he were, that will explain his father’s power, for example, even his mother’s desappearance. What I hope is: 1) Yuffi be his next girl 2) The Author changes her mind and allow Damian/Ethan NTR Tania 3) He soon adds Ruby and Clea to the harem