Skeletal abnormalities

My husband has a rib on the bottom left ribcage that sticks out noticeably. Recently, I have noticed that our 15 year old daughter has the same protruding rib, in the same spot. She is able to "wing" her shoulders, and to get a laugh will carry things between them. Her wrist joints are always popping, even with little movement. I have also realized that her left shoe has very uneven wear in the sole, the inside of the left shoe barely exists at this point, making the sole look like it was shaped in a wedge with the side of the shoe overhanging. Her right shoe looks fine. I had her show her doctor her rib and shoulders, he did a physical examination, but told me not to worry, she just had too much space between her joints and he would only be concerned if she were doing gymnastics or such. Is this something I should be concerned about? Could there be something inherited from her father as they have the same rib structure. Should she take any precautions or have future problems?