Frank, same thing happened to me! I am a lot younger than your sister being born in 78, so I went into Kindergarten around 84 I guess. My kindergarten teacher was extremely old and had been a teacher for her whole life. Up until kindergarten I was left handed, but thanks to her I am kinda ambidextrous-ish. For everything except throwing something I can use either hand. I am right eye dominant, but shoot a handgun left handed and with my left eye while keeping my right eye open (I have no idea how I do it, just always have). I can shoot at a fairly high level and have been through several very well known courses, the instructors usually leave me alone after the initial assessment. My transition from long gun to hand gun is interesting / unconventional going from the right side with the long gun to the left with the handgun.