Yes I believe the divisions between EDS types is somewhat ‘fuzzy edged’. I have been diagnosed EDS III, though I have traits of the vascular type (type IV), I’m awaiting a geneticist appointment to confirm one way or the other.
Regarding whether EDS skips generations, let me say that my mum had the thumbs touching arms ability but I don’t, she also had the flat feet and heart murmur. I only have minimal bendiness (knees mainly), yet my children, certainly the girls are quite bendy, especially their hands. I suppose we all inherit varying degrees of it.
Head & Neck Injury (June 2002); Mild Concussion; Post Concussion Syndrome; Postural Orthostatic Tachycardia Syndrome (POTS); Peripheral Vestibular Dysfunction; Mild Radiculopathy & Small Fibre Neuropathy (right leg & foot resp.); Partially Empty Sella (Oct 2002) Fully Blown Empty Sella (Oct 2004); Whiplash Associated Disorder (WAD); Cerebellar Ectopia (Chiari 0); Cranio-cervical Instability (CCI) with Posterior Gliding (PG) & Cranial Settling (CS); Brain Compression; Retroflexed Odontoid; Stretched/Elongated Brainstem; Vitamin D deficiency; Ehlers Danlos (EDS) type 111; and now Osteoarthritis! and oh, I forgot Arrhythmias – confirmed as runs of Bigeminy and Trigeminy.