السلام عليكم ورحمة الله وبركاته، أحسن الله إليكم My cousin female that has been breastfed by my grand mother(mother of my father) is my mahram? I can't marry her childrens right?

Ustadh AbdulAziz al-Haqqan

Are you saying she is your aunt? If she is your aunt why can't you marry her daughter? I might have misunderstood baraka Allahu feek.