A woman has twins, and gives them up for adoption. One of them goes to a family in Egypt and is named "Amal." 

The other goes to a family in Spain; they name him "Juan". 

Years later, Juan sends a picture of himself to his mum. 

Upon receiving the picture, she tells her husband that she wishes she also had a picture of Amal. 

Her husband responds, "But they are twins. 

If you've seen Juan, you've seen Amal."