I feel as if we are in a Demo society. It's finger pointing, blame finding at its best. It's never your fault. PULL-EASE. Well, here's another example of who you can blame. Now, if you can't blame your parents and your upbringing, or a faulty set of gene's, you can blame your siblings. Forgive me while I laugh. That's rich.
Ok. There is a certain amount of truth to it. Your social skills were formed and molded within the family, specifically with your siblings. However, you can't use your siblings as a scapegoat for your issues. Was it Dr. Phil that said once you leave home and move out on your own, you can only blame your parents and "homelife" for your issues for up to 1 year. By then, you have developed a survivor mode that kicks in and allows you to manage life. After that 1 year, you have no one to blame but who? Oh yeah. YOU.
To my 1 brother and 2 sisters: you are off the hook! :-)