Twins represent your psyche’s polarity, like extroversion or introversion, and your masculine and feminine sides. In oneiric terms, if you dream of a person who looks just like you—either a double or a twin brother—it means you need to return to your essence and to restore internal harmony. It can also reveal problems of identity or serious personality imbalances.
Many ancient cultures believed that twins were divine characters. According to another superstition, they had different fathers; one of them was a god or a spirit. The dream may be showing you, in this sense, your spiritual side.
If a woman dreams of delivering twins it is omen of cheating.
[1]1. Other self, identity symbol (in a non-twin dreamer).
2. Doppelganger, mirror image, representing conflict, opposing values.
3. Pregnancy with twins.
4. Domestic joy.
[2]