Rock-a-bye Babies??

Your FC is walking back home from (meeting, etc.) and they trip over a basket containing two twin babies. One baby is a light blue and the other a darker blue with black hair and blue streaks. The light blue baby has black hair also, though no streaks.
A note attatched to the basket reads:
Please look after these two twins.
Anonymous

Your FC takes the basket home and cares for the babies. The babies fall asleep and your FC puts them in bed. When the twins wake up, your FC finds a surprize......