Demon Slayer: Dragon Elephant Swordsman

My name is Kamado Takeo, and I don't know which son I have in the Kamado family. My brother's name is Kamado Tanjiro, my sister's name is Kamado Nezuko, and my father's name is Tanjuro. What is before me now is a life and death problem. That means Kibutsuji Muzan is already at my door. What do I do? Can I protect my family well? [The protagonist is reborn in the Kamado family. During the rebirth process, he sees the stone wall recording the Dragon Elephant Prajna Kung Fu. After practicing hard in anger, he punches Tongma and kicks him without mercy]