She's technically your aunt-in-law. You obviously wouldn't actually call her "Aunt in law Sally", so you should just refer to her as "Aunt Sally."
the daughter's cousin
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.
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.
Mother: Demeter Father: Zeus Uncle/Husband: Hades Uncle: Poseidon Aunts: Hera, Hestia
Hades is Persephone's husband, Zeus and Demeter are her parents. Persephone's aunts and uncles are Hestia, Hera, Poseidon and Hades.
Yes, it should be, it is not considered incest because it is not by blood. You are marrying your aunt's HUSBAND'S daughter.
The possessive form of the plural noun aunts is aunts'.Example: My aunts' names are Alice and Anne.
He's called your uncle becasue your mother's sisters are your aunts and the people married to them are your uncles (assuming that they're men).
Your aunts' grandkids are your cousins. They are the children of your aunts' children, making them part of your extended family. Depending on the number of aunts and their children, you may have multiple cousins who are considered your aunts' grandkids.
Who is Hermes aunts
Your aunts and uncles are the sisters and brothers of your parents.
The possessive form for the plural noun great aunts is great aunts'.Example: My three great aunts' house is a great place to visit.