Raving about working aside, what's wrong with this? Kids get sick a lot and you definitely need 2 jobs to comfortably pay for them these days.
Loads of my coworkers work an extra day from home when their kids are sick and it works great. I'd say it's probably one of the best reasons to work from home.
Edit: I work from home about 2-3 of my 4 work days. I only go to the office to see my coworkers voluntarily or for the physical meetings. I would not wish forced full time in person days for people who can work from home.