Lex William had grown up with three sisters but, oddly enough, never in his life did he ever feel like he needed to protect them. He had traveled the world with his family, so he was quite familiar with the fact that in most countries, brothers were culturally taught to be protective of their sisters. Even in the countries where this was not a thing, simply out of sibling affection, brothers and sisters would look after one another.
Yet, despite knowing all this, he never felt weird for not feeling protective of his sisters. There was one very simple reason for this. His elder sister, Belle, was a freaking maniac. Not only was she cold and aggressive, she actively made it a point to be as merciless as she could possibly be. To top it all off, she had not a shred of fear in her body, and could not be intimidated at all. Even when they were kids, Lex clearly remembered that Belle would not shy away from scolding even her parents if she thought they were in the wrong.