Hi! Welcome to HCM! No,it is not a coincidence.They are also showing signs of this syndrome. Ehlers–Danlos syndrome (EDS) is an inherited connective tissue disorder with different presentations that have been classified into several primary types.Type 3, is caused by an autosomal dominant mechanism. Mutations in either of two separate genes may lead to this variant. Joint hypermobility is the hallmark of this type, with less severe skin manifestations. Joint instability and chronic musculoskeletal pain are particularly prominent in this type. Patients with the Hypermobility Type experience frequent joint dislocations and subluxations , with or without trauma. Ehlers-Danlos syndromes are treated according to the particular manifestations present in a given individual Joint injury must be avoided. Occasionally, bracing may be necessary to maintain joint stability. Exercises that strengthen the muscles that support the joints can help to minimize joint injury. Contact sports and activities involving joint impact should be avoided. hope this helps!