Julia Caesaris, Caesar's aunt, was married to Gaius Marius.
aunts
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Your are related to some of your first cousin's aunts and not to others. The aunts of your first cousin to whom you may be related are your mother and her sisters or your father's sisters. One of the parents of your first cousin isn't related to you, but married into the family. Anyone of your cousins aunts who are related to that person would not be related to you.
They become your spouse's in law's & aunts/uncles to any children they may have already.
The possessive form of the plural noun aunts is aunts'.Example: My aunts' names are Alice and Anne.
If your great uncle married into your family some of his nieces and nephews are your aunts or uncles (or your parent) and some are not related to you at all.
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
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 and uncles are the sisters and brothers of your parents.