Is it permissible for a young man to marry his maternal cousin if the girl's elder brother was nursed by the girl's maternal uncle and the young man's maternal uncle?

The suckling of the girl's brother by her maternal uncle's son is not forbidden, because the prohibition due to suckling is specific to the suckled child and his offspring, and does not extend to his siblings, parents, paternal uncles, or maternal uncles. Therefore, it is permissible for this person to marry his maternal aunt's daughter, whose brother was suckled with her maternal uncle.