Most certainly it is possible to start a company while also being a parent. When Matt Shobe, Dick Costolo, Eric Lunt and Steve Olechowski started their first company called SpyOnit, they had all already had kids, which allowed them to have similar mindsets and to be on the same page about working hard but also going home to their family. Co-founders all had empathy for each other and were willing and able to help each other when needed.