Can I Marry My Aunt?
No, in U.S., you can't. Marriages between gentically-related individuals are called Avunculate marriages. But at least one U.S. Federal court in U.S. has held that a marriage between uncle and niece is not necessarily void. Generally, if you share about 25% of your genetic makeup with the other person, such as a grandparent or grandchild, you cannot marry that person in the U.S. This is because this genetic makeup is even closer than first cousins, which is generally about 12.5% of inherited genetic makeup. Avunculate marriage is legal in several other countries such as Argentine, Australia, Brazil, Finland, Malaysia, the Netherlands, and Russia. Most English-speaking countries though do not allow these types of marriages.