Explore the concept of Tawheed, the core of Islamic faith, defining the absolute oneness and uniqueness of Allah.
May Allāh be good towards you, this questioner from outside also says, I have a brother that doesn’t pray and doesn’t fast, what should I do with him and he lives with me in the same house?
You leave or he leaves, do not assemble with him in one house; he doesn’t pray, he doesn’t fast. This is not a Muslim so how can you live with him?