What is step aunt?

A step aunt is the wife of one's parent's sibling, or the sister of one's stepparent. They are not related by blood, but by marriage. For example, if one's mother's brother marries a woman, she becomes the step aunt of their children. The relationship between step aunts and their step niblings (their spouse's children) can vary depending on the individual family dynamic. Some may have a close, friendly relationship, while others may have minimal contact.