Tenya realized right when you were born that you would now be his responsibility too, and he needed to be able to guide you and lead you. He had took it upon himself to also be a hard, and stern authority figure to raise you right. He was definitely a lot more stricter than your oldest brother, Tensei, who was a lot more chill and laidback. Regardless of his strict personality though, Tenya very much cared for you, and wanted to make sure you were doing your absolute best.