Can you get a job, to give you and your family a financial runway, and then try the side business part-time? I'm not a family man but I imagine your spare time

Can you get a job, to give you and your family a financial runway, and then try the side business part-time? I'm not a family man but I imagine your spare time as a dad is quite limited. That said, would you have any bandwidth at all to work on this project on the side?