Short answer is that, like everything in life, it is harder as a parent.
I've meditated for ten minutes a day for a few months now and written 500 words a day so far this year. The chain method absolutely works (I'll stay up late at night staring at a blank page until I get to my 500 words) but it can be a chore. I go through with it because I know that once I break the chain that makes it easier to break it tomorrow.
I'm hoping that my current work craziness calms down a bit in a few weeks at which point I'll be scheduling these two things on my calendar in the morning and not start the rest of my day until they are done.
Get the spouse to hold the kids. Even if you're a full time housewife, many husbands are willing to hold the baby for a couple hours each evening. Maybe take them for a walk, bath, watch YouTube together.
My wife's flow activities is experimenting with cooking and child care. We've actually got a couple of apps in the works for this.
I'm sure it's absolutely possible but between a 2 month and 2 year old I don't come close to finding the time to think about extra projects.