Are the sons of the paternal uncle who were breastfed by the stepmother considered brothers or not? And is the third brother, who was breastfed by another woman who is not the mother, considered a brother? And are siblings through suckling considered siblings only to the children of the nursing mother, or to everyone?

A woman becomes a suckling sister to anyone who has suckled five times from her mother, or from her father's wives, provided that the milk resulted from intercourse with her father. If it is established that your two paternal cousins and the third child suckled from your father's wife, they become your suckling brothers and mahrams to you, unless the milk they suckled from was from a man other than your father.