A blog is supposed to be a place where you can tell people about your life and give your opinion regardless of what it is. There are many times in a marriage and parenthood when things aren't going great.
It could be stress, money or a millions of different things that culminate in short fuses and mean words. You may be tempted to share these on your blog. It's a great way to get things off your chest and odds are you probably find support from other in the same situation.
Don't! When your wife makes you mad, is always in a bad mood or even insults you in a horrible way, don't air your grievances on your blog. Odds are in a day or two whatever you were made about has blown over and you've move on to the next big crisis.
If you have a blog post up about it and she sees it, then you're going to be in a heap of trouble and not only have you brought that argument back to the surface, but also added an entirely new dimension. Many times people say marriage is about compromise, but in reality it about just making it through day by day.
You're going to have good days, bad days, good weeks and bad weeks. Live for the good times and try to put the bad ones behind you. Blogging about will only cause further animosity down the line. When it comes to airing your familial frustration, keep your mouth shut.