If the case is as mentioned above, and
breastfeeding occurred five times or more in the first two years of the child's life it would be prohibited for the son who was breastfed to marry daughters of his paternal uncles and aunts. He became a foster brother to his paternal uncles and aunts, and became a paternal uncle to their children. (Part No. 21; Page No. 21) Allah (Exalted be He) says:
The mothers shall give suck to their children for two whole years
He also says:
Forbidden to you (for marriage) are: your mothers, your daughters
to His saying:
...your brother’s daughters, your sister’s daughters
It was authentically reported that the Prophet (peace be upon him) said:
Milk relationships are equal to blood relationships in rendering marriage unlawful, i.e. whatever is prohibited due to blood relationships is also prohibited by milk relationships.
It was narrated on the authority of
`Aishah (may Allah be pleased with her) that she said: It was among the revelation of the Qur'an that ten known times of breastfeeding make the marriage prohibited, but this was later abrogated and reduced to five. The Messenger of Allah (peace be upon him) died and the ruling remained effective. If the baby sucks milk from the breast and leaves it, this would count as one time of breastfeeding. If he returns to the breast, it would be another one, and so on.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.