Does the older brother of the female cousin's son become a brother to the questioner and her sisters, even though they were not nursed by the aunt, given that their younger brother and the female cousin's younger son were nursed by the aunt?

"Suckling makes unlawful what lineage makes unlawful. Thus, whoever suckles from a woman becomes a son to her and to her husband, the owner of the milk. This applies exclusively to the suckled individual, not their siblings. So, if your youngest brother suckled from your maternal aunt, he becomes a brother to all her children. And if your aunt's youngest child suckled from your mother, he becomes your brother through suckling. As for your aunt's elder child, he does not become your brother unless he suckled from your mother or there is another suckling relationship between him and you. It is a condition for suckling to establish prohibition that there be five full, satisfying sucklings."