That all sounds slightly incestuous, but she is your mum obviously, 'cause you told us at the start!!
Your aunts and uncles are the sisters and brothers of your parents. So they are "blood related." But you also call the husband of your mother's sister your uncle, and he is not "blood related." So aunts and uncles are not always really related to you.
Your mother's aunt's husband's sister is your mother's aunts sister-in-law but is not related to you. Her son is not related to you either.
Yes, they are related directly to you. They are your mothers sister. And your father's sisters.
their parents, brothers, sisters, cousins, aunts, uncles, and people who are related to them.
Your aunts and uncles are the sisters and brothers of your parents.
Your great aunt is the sister of one of your grandparents. The wife of one of your grand parent's brothers is your great aunt by marriage. Another way to look at it is that your great aunts are the aunts of one of your parents.
Your aunt is the sister of either your father or your mother. If your aunt is your father's sister, then your father's cousin is also her cousin. If your aunt is your mother's sister, then she is not related to your father's cousin.
You are not related to all of your brother-in-law's family, but you are related to some of them. You are related to your brother-in-law. You are related to his wife, your sister. If he and your sister have children, you are related to them - they would be your nieces and nephews. But you are not related to your brother-in-law's siblings, cousins, parents, aunts, uncles, grandparents, etc.
People who are related to you: parents, brothers, sisters, cousins, uncles, aunts, grandparents, etc.
She could bea) your motherb) another aunt by marriage, or by blood (i.e. your mother's sister).(Note that under -b- your father's sister's sister-in-law could also be his sister-in-law too.)---Your father's sister is your aunt.Her sister-in-law may be her husband's sister. You are not related to that person.But her sister-in-law could also be the wife of one of her brothers. That would include your mother, as well as the wife of any other brother your father might have. Your father's brothers are your uncles and their wives are also your aunts.
Since your mother and her sister have thesame aunts and uncles, your mother's sister's aunt is your grand aunt or, as some sat, your great aunt.
Your great grandparents' brothers and sisters are your great great aunts and uncles.