A boy suckling five times from a woman immediately after suckling from his mother
The breastfeeding that prohibits marriage must occur five times or more during the first two years of the baby's life. If your mother breastfed the man in question according to the way mentioned above, he would be considered a foster son to your mother and a foster brother to you and your siblings. Therefore, it is permissible for you to take off your Hijab in his presence. Allah (Exalted be He) says:
Forbidden to you (for marriage) are: your mothers, your daughters
to His saying:
...your foster milk suckling sisters
He (Exalted be He) also says: (Part No. 21; Page No. 33)
The mothers shall give suck to their children for two whole years
It was authentically reported that the Prophet (peace be upon him) said:
Breastfeeding prohibits what consanguinity prohibits, i.e. in marriage.
Moreover, it was authentically reported 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 takes the breast and sucks milk from it, this will count as one time of breastfeeding. If he leaves and returns to it and sucks milk from it, it will be another one and so on).May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.