I have a couple, actually. I have my professional one, for my writing, which has limited personal information (for example, I might mention my children, but not their ages, gender or names, but relate a story about how we spent the day at a park or something). The idea behind that being that people who read my blog don't just want to read about how I spent 8 hours writing 2 chapters today, lol, but instead want to know about me the person, too. I have another one about homeschooling which has slightly more personal information, because I'm writing about various things that go with homeschooling (for us, anyway): ADHD, single parent, etc. So that one has a little bit more personal info, but again, no names or anything like that.
I don't have any public blogs that contain real, personal info about my life or my family. Too easy for people to track you down, plus I feel my kids are entitled to some privacy.