Obviously their mother and father brought them! The parents claim that they can tell the child's sex by looking at their faces but I don't agree. The one on the right has a very distinctive face which makes it easy to differentiate between them. He's the boy and is called Yehonatan (Jonathan - "God gave him") whereas his sister is on the left is called Hila ("halo").
The above is not a very good picture: it was taken from my mobile telephone without external lighting. Such is my attempt at being modern. I'm surprised that the babies don't have their own facebook pages - they could have updated their status to "visiting uncle and aunt".