There was manga about step-siblings (the strong one will be alive thingy) The motherfu*ker older brother asked his 5 year old step-sister for Marriage and having kids..(Because the step-sister 5 year old child was too powerful)
Comment by Anime+Manga=Life on My Family is Obsessed with Me - Chapter 30
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@Anime+Manga=Life The Princess Is evil right? The brother/cousin is crazy in his own right but he changes a tinc little bit. Keeping in mind who is the actual male lead is...