If you have read the article about the causes of SPD, you might remember I promised to dig a little more in details about my case. If you did not read it, I suggest you do it now: http://schizoid-personality.110mb.com/inner-thoughts/we-know-the-effects-but-what-are-the-causes/
On the genetics front:
My dad was definitively an introvert. I clearly remember him enjoying working in is wood shop, all alone (he re-made both apartments we lived in, integrating furniture, closets, putting separations and such). When he was not in his shop, he was reading, and after the death of his parents, he was in their home (40km outside the city) all week-ends, gardening and doing handy work by himself.
I remember him murmuring to himself, stopping when he sensed another presence in the same room. He also had some body language (eyebrow rising, slight shrouding…) completely off topic with what was happening around him (especially around the dinner table), and I know now those were responses to his own train of thoughts since I happen to do the same from time to time 
So introvert he was, for sure, but I miss more details to be able to know if he was “just” introvert or had fully developed a “disorder”. For example, he had always some socialisation with his coworkers (though usually to have some drinks after work). I’ve never seen him trying to dodge a family reunion (like I always do…) in fact we were at my grandparents once a week, rotating between paternal and maternal side for a long time. He was at ease with big reunions like weddings, birthdays, etc… Chatting and joking.
On my mom side I cannot see anything genetically tied to introversion or such. (and it seems I dodged the respiratory issues).
So yes if genetics are a defining factor (still not proven yet), then I have some assets in there.
I’ve read a post on 
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