Is the marriage of the questioner to Sarah Islamically permissible, knowing that his maternal sister breastfed Sarah?

If your mother's sister (your maternal aunt) breastfed her paternal half-sister (Sarah) five known times, Sarah becomes her daughter through suckling. Consequently, you become her maternal uncle through suckling, based on the Prophet, peace and blessings be upon him, who said: "What is prohibited by lineage is also prohibited by suckling." Your marriage to her is invalid, and you must separate from her immediately. The son and daughter born from this union are attributed to you due to the شبهة (doubt/ شبهة عقد النكاح).