Maurice Utrillo Painting?

I have a Maurice Utrillo painting called Paris Street. It was painted in 1914. I did some research and found out he's a pretty big deal. The painting is also one of his more popular. I want to know if it's real or a print. It belonged to my grandparents. I found only a couple sites on the web that talk about it. They say it's at The Art Institute of Chicago as part of The Helen Bartlett Collection. I went to their website and they list all the painting from Utrillo and all the painting that are part of The Helen Bartlett Collection. Paris Street isn't listed. Obviously I'm a little confused. The thought that I could have a famous valuable painting is silly. Can anyone help?