Ruling on marrying the daughters of mothers by breastfeeding

Q 1: When my father was a young man, he married a woman with whom he had sons and daughters. The youngest of them was still small when his mother - my father’s first wife - became ill. Some of her female relatives took the baby and one of them breastfed him until he had grown; strictly speaking, more than five times. During his first wife’s illness, my father married my mother and they had me and my brothers and sisters. His first wife passed away after a while from her illness and her youngest son remained with my father. What is the ruling on the marriage of the sons of the women who breastfed this youngest son, especially the woman who breastfed him until he grew up, with my full sisters? These sisters are the paternal half-sisters of the son who was breastfed by those women. I hope that you will clarify the ruling. Also, what would the ruling be on one of the paternal half-sisters of the stated son marrying a son of this woman? Please clarify the matter.

A: If the reality is as you mentioned, it is permissible for one of your full sisters (Part No. 21; Page No. 126) to marry one of the sons of the woman who breastfed your paternal half-brother. Their marriage is not affected by the breastfeeding.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.