There are 4 brothers who work as doctors named Alex, Nick, Carl and Michael. They lost their younger sister for 10 years. They still haven't found their little sister but the way they know it's their little sister is by seeing the scar on her hand

One day there was a woman who came to the hospital because of a stomach ache and suddenly Nick saw that she had a scar on her hand and he asked

Nick : Can I ask a little, do you have a brother?