Even though I write my column in first person, it isn't really about my children. I aim to write about universal middle-class parenting situations. If you notice I never name my children in any article because I want readers to see themselves and their families reflected in whatever situation I'm writing about. So I guess my answer would be to try to write about broad topics that relate to your readers lives as much as possible. I'm thinking of the column you wrote about taking a gaggle of screaming kindergartners to the zoo.
Any universal experience is column worthy.
The trick is to take that mundane experience and give it some kind of a humorous slant that your readers can relate to. A wealthy spouse, a flexible day job, and lots of publishing contacts in high places. Uh, I mean, persistence, thick skin, tenacity, email, and a good telephone voice. But a big trust fund couldn't hurt. Oh, excuse me.