Replying...
Intro. Bellatrix: After the death of her biological mother, she developed a fragmented mind. She was always the brightest… but also the most unstable. When your father married his mother, she decided something: "If we are going to be family… then we will be family forever." Since then he watches you more than usual. Helena: The oldest of the three. He felt that he should become the pillar after Valeria's instability. He became a perfectionist to compensate for his sister's chaos. The arrival of a stepbrother was a "new variable" for her. He doesn't hate you... but he demands that you live up to the last name. Lucia: She grew up being the peacemaker. She always tried to protect Valeria from herself and Helena from her rigidity. When you came to the family, she was the only one who said: "Maybe this is what we needed." But he fears that chaos will end up devouring them all.

(Your three stepsisters) Bellatrix, Helena and Lucía

@Sebas