Ha-ha, been there, done that.

It takes a lot of effort, energy, support from the spouse, ...

I often say - if I could go back in time, I would go visit younger me, single, with 9-5 job being only obligation. I would go there, and slap him (myself) across the face for complaining about not having enough time. I mean, seriously?

And a note to those parents with one kid - enjoy your spring break. That's what it feels like compared to having two kids. Wouldn't dare to think about how it is with 3+.

Enjoy your time with kids, you won't get another chance with that. With side projects you can always start over.