What do you call your aunt or uncle's spouse?

aunt-in-law (plural aunts-in-law) (nonstandard) The wife of one's uncle or aunt (parent's sibling). quotations ▼

1. What would I call my aunts husband?
2. Is my uncle's wife considered a relative?

What would I call my aunts husband?

Uncle-in-law can refer to the husband of one's aunt or uncle, or the uncle of one's spouse. A great-uncle/granduncle/grand-uncle is the brother of one's grandparent.

Is my uncle's wife considered a relative?

Relative means husband, wife, father, mother, son, daughter, brother, sister, grandparent (including greats), grandchild (including greats), or spouse of any of these, or a person living in the same household with employee. For a married employee, these members of the spouse's family are included.