Your aunt is either your parent's sister or the wife of your parent's brother. If she is your parent's sister, her husband, his sister and her daughter are not related to you. If your aunt is the wife of your parent's brother, then her husband's sister is your mother (and her daughter is you or your sister) or she is another of your aunts (and her daughter is your first cousin).
You
Your grandmother's sister is you parent's aunt. Her son is your parent's first cousin andyour first cousin once removed.
Your grandfather's sister-in-law is your parent's aunt and your great aunt.
I'd like to introduce you to our sister concern company, which operates independently from our parent company. While we understand your disqualification of our parent company for some reason, we believe that our sister concern can offer you a fresh perspective and a different experience. Our sister concern maintains its own standards and values, and we are confident that they can provide you with the service and products you require.
Your sister is your female relative who shares the same mother and father as you do. If she shares only one parent, she is your half sister.
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Your sister's husband is called your brother- in-law.
Tetrad
No. Your uncle is either your parent's brother or the husband of your parent's sister. A few people try to use "uncle-in-law" to describe the husband of your parent's sister, but the term is a little used, invented term that is not widely accepted.
Usually, The oldest sister is called "eldest" and the youngest sister is called "youngest" or "smallest".
A member of a sorority, to other members, is called a sister, and a member of a fraternity to other members is called a brother. ex "My sister in Gamma Kappa Phi is picking me up later to take me to the philanthropy"