George Sr. was clearly a decent guy AFTER the timeline divergence, so I'm sure he was one BEFORE it as well. 

Or Kirk or McCoy
Based on Sam assessment he seems like a hard father to please, George looks down on his career path because his son, Sam is not command track. Kirk is the favored one. Kirk senior sounds like a human Sarek.
Typical of siblings. Even ones with good parents.Sam’s the older brother and no doubt resents Jim’s success a little.
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