My wife went out of town for 5 days and I _tried_ to take care of my 4 kids while working my FT job. I somehow managed to work 3/4 time just barely by working before they woke up and after they went to bed, and was mostly able to keep the kids fed, clean, and semi-entertained. It was not sustainable, not by a long shot, and I'm not a founder or co-founder.