I tend to go overboard with things, but these days more in areas where it doesn't matter that I do. Along the way I've sorta learned to better judge situations and know when to back off a bit. For example, in various jobs I've sent some somewhat questionable emails, which have at times offended people. In my current job I have a pretty good boss, and he knows I can go a tad too far sometimes, so I'll send him what my reply is going to be for him to read over first. Or I'll just forward the original email to him and ask his opinion on how to approach it.
In other areas of life, if it's an area where it could cause problems, I'll try to keep relatively calm. I can take an argument to utterly absurd levels based on logic and principles, and once I start I just won't stop. At the time it might not seem so ridiculous, but I can think back later and see that (even though I might have been right

) perpetuating and escalating the whole thing just really wasn't helping much. So I'll keep myself back, despite the urge to verbally rip the person apart, and then afterwards I'll take my anger/frustration off somewhere for a bit of "me time". If I'm at home, I'll play or work on one of my guitars, play games, watch a movie, read, whatever... if I'm at work, I'll put my headphones on and bury myself in my own work, or maybe go outside for a cigarette, etc. Even if I'm at someone's house with a bunch of people for some kind of gathering, often I'll just go outside or into another room on my own for a bit and put my headphones on. If I'm out somewhere (pub or whatever), I might go outside on my own for a smoke just to get away for a bit.
As for family members... I'm not the one to comment on that specifically. I've never particularly been too close to my family, and because of one particular member, I have very little contact with any of them anymore. Not even sure they know where I live at the moment. Before I moved out, I just spent a lot of time on my own in my room doing my own stuff. These days, I don't see any of them much at all, I don't go to Christmas things or anything like that.