In my house, Mom was always the soft touch... but you didn't play with Dad... suffice it to say he was an ex-drill sergeant (among other job descriptions in his 20 year Army career)...
Now, I'm not saying he was abusive or anything, he was a good Dad... in fact, he often warned you that you'd crossed over a line, saying:
"Boy, you want to watch that mouth-- before it swells up on ya... "
Subtle, but effective... LOL...
I also heard him come up with one of the funniest lines I ever heard in response to some drunk he wanted to fight him:
"Son, I've whipped better men than you just to GET to a good fight"...
The drunk in question looked at Dad confused for a minute, then busted out laughing...
I can admit that I have on occasion ripped off both lines...