I know for sure that I'm an ISTJ. So is my Mom. I'm still working on my sister, but I figure I'll ask for some superior help on my Dad, if anyone is interested.
I was raised mostly by my Mom, whom I get most of my personality traits from, and quirks/pet peeves. (I'm actually quite a bit like her Dad.) This isn't to say that I don't have a good relationship with my Dad, I do, but he works. It's only natural that I spent more time with Mom as a child.
Anyway, I'll move on. The "traits" I have that my Mom does not, that my Dad does have, are these:
*Extremely calm. Almost never gets angry.
*Able to think calmly and clearly in emotionally stressful situations. (Such as a death in the family.)
Here are traits found in my Dad that I lack:
*Able to talk to anyone, anywhere, for no particular reason. The "Gift of Gab", my Mom calls it.
*Very compassionate. (Not in a mushy way, mind you. My Dad is a very "masculine" kind of dude.) (I have compassion as well, but not nearly as much.)
And finally, here are some traits that I have, but my Dad does not:
*My Dad is very intelligent, so don't take this wrong. I gather and retain knowledge faster and more efficiently than he does. He has some problems with memorization. (For example, he requires more repetition in math to get better grades. I do not.)
*My Dad is more likely to leave stuff behind for my Mom to clean up. I'm not saying he's messy, I'm just saying Mom and myself have minor cases of ISTJ-OCD.
Okay, I think that's good. If you want more information, ask away. I have a feeling he's xSTx. Not sure where to put the others as.