Is it permissible to marry the sister of one's maternal cousin's son, with whom one was nursed?

If you were nursed by your maternal aunt five times, then it is forbidden for you to marry her daughters, because they become your sisters through suckling, based on the Prophet’s (peace and blessings of Allah be upon him) saying: "What is unlawful by lineage is unlawful by suckling." However, if you and your maternal aunt's son were nursed by your mother, and you were not nursed by his mother or his wife, then she is considered a stranger to you and it is permissible for you to marry her, unless there is another impediment.