A Question on Breastfeeding

Question:
A woman gave birth to a son, and a child from the neighbors was breastfed with him, but he did not exceed five breastfeedings. After that, the mother gave birth to a daughter, and the brother of the first infant was breastfed with her, but this one was breastfed for a month or more. After the mother gave birth to a daughter, and no one was breastfed with her, is it permissible for the first infant, who did not exceed five breastfeedings, to marry the other daughter, who was not breastfed with anyone else?

Answer:
If he was not breastfed a complete five breastfeedings or more within the two years, he may marry the daughters of a woman from whom he was breastfed a few times, less than five, because they do not become forbidden to him. The correct opinion among the statements of Abu al-‘Izz is that the amount of milk that makes a person a relative through breastfeeding is five breastfeedings, as in the hadith of ‘Aishah in the Sahih. Anything less than that does not make them forbidden. However, if he leaves it off out of caution and scrupulousness, considering the mixing of men and women and to avoid the scholarly disagreement, that is better. This is because some scholars hold that any breastfeeding makes them forbidden, while others hold that three breastfeedings make them forbidden. So, out of caution and scrupulousness regarding the disagreement, it is better to leave it off. As for the prohibition, she is not forbidden to him unless he was breastfed by her mother five times or more. So, he may marry the daughters of a woman from whom he was breastfed less than five times. May Allah reward you with good.