If your dad marries your mom's sister what do you call her?

Mom dies, dad remarries her sister. What do you call her? Aunt, Mom, or something else? or:Mom dies, dad remarries her sister. What do you call her? A

Mom dies, dad remarries her sister. What do you call her? Aunt, Mom, or something else?

or:Mom dies, dad remarries her sister. What do you call her? Aunt, Mom, or something else?

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