Source: The Great Interpretation of Dreams (Ibn Sirin)
Giving birth to twins in a dream indicates joy and relief. If they are males, it is worry followed by relief. If they are females, it is relief and abundance.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
Twins indicate an increase in sustenance and goodness.
Source: Signs in the Science of Expressions (Ibn Shaheen)
Twins are interpreted as goodness and blessing.