Well, as I still couldn't buy something from the system yet, I couldn't buy half-blood Prince's spell, which is my regret.
Well, magic from family tomes was available to me, and I started learning it, including black ones.
Well, those 3 have also started learning occlumens to learn magic further and sort out their minds, emotions, and memories.
Well, for balance, I also need to learn white magic.
After further dwelling on magic, I concluded that magic divided into white and black is nonsense. You can use both types of magic for good and harm. It depends on the user's intention and emotions.
Well, all three of them were doing great. We performed a ritual to cleanse our blood, which is considered black magic according to this modern time. Also to enhance our talent. I was able to see that all my talent has changed from max to unmeasurable.
My most prominent bloodline, Hazelhart, appears to be the most powerful on my father's side.
Also, they have activated blood magic and are protected by family wards, which were activated instantly.