Al-jawab billahi at-taufeeq (the answer with Allah's guidance)
The list below are Mahrams, besides these will be your Ghair Mahrams whom you'll make Hijab from.
A Mahram refers to the group of people who are unlawful for a woman to marry due to marital or blood relationships. These people include:
1. Her permanant Mahrams due to blood relationship, and those seven are: her father (including father's father and mother's father etc,), her son (who passed puberty) (including son's son and daughter's son etc,), her brother, her uncles from her father's side (paternal), her brother's son, her sister's son, and her uncles from her mother's side (maternal).
This rule also applies from a male's perspective; his mother (including mother's mother, father's mother etc,), his daughter (including daughter's daughter and son's daughter etc,), his sister, his paternal aunties, his maternal aunties, his brother's daughter, and his sister's daughter.
2. Her Radha' Mahrams due to sharing the nursing milk when she was an infant, and their status is similar to the permanent seven Mahrams (i.e. nothing can change their status).
This rule also applies from a male's perspective same as above.
3. Her (in law) Mahrams because of marriage and they are: her husband's father (father in law), her husband's son (step son), her mother's husband (step father), and her daughter's husband (son in law).
This rule also applies from a male's perspective; mother in law, step daughter, step mother, and his son's wife (daughter in law).
