Son has double joints, long limbs, long wrist, fingers & hands. could it be marfan syndrome? something doesn't seem right.

Could be: You might be right! Take him to a doctor for a good evaluation. Best of luck!

Probably Marfan: Your son may have Marfans syndrome. He needs to be examined. To diagnose Marfan a host of major & minor criteria needs to be met, like pectius carinatum, pectus excavatum, scoliosis >20%, joint hyper mobility, ocular- ectopic lentis, dilatation of ascending aorta, dissection of ascending aorta.Best wld be to see a Geneticist who also will coordinate with other doctors to have echocardiograms etc.

Possibly: Needs to see a doctor and be checked for Marfan Syndrome.