Ruling on marrying a woman one suspects is one's milk sister

The question: A message was sent from Yemen by the listener: Ramez Qa'id Muhammad Sufyan. Our brother says: I am a young man who wants to marry my cousin. The family told me that she was breastfed by my mother, but they do not know how much she was breastfed, whether a little or a lot. They also do not know if it was five suckles or less. The important thing is that they told me: she was only breastfed by your mother. So what is the guidance of Shaykh Abdul Aziz? Should I propose to this girl or stay away? May Allah reward you with good.
The answer: If she was not breastfed by your mother five times or more within the two-year period, with valid legal evidence, then she is permissible for you and not forbidden to you, except by five breastfeedings or more, provided they occurred within the two-year period, by the mother's admission or by the testimony of trustworthy men or women that this took place. However, leaving her alone is more cautious and better, in the sense of avoiding what is doubtful, due to the saying of the Prophet (peace and blessings be upon him): , and his saying (peace and blessings be upon him): . So seeking another daughter with no doubt about her is more preferable and better. Otherwise, she is not forbidden to you as long as the breastfeeding is doubtful and it has not been established that it was five breastfeedings within the two-year period, in which case she is not forbidden by that. Yes.
The presenter: May Allah reward you with good and do you good.