I married my co-founder. Five years later, when we were both working at GE Capital, we started a side business that grew rapidly. Having my wife as a co-founder was the best of all worlds...I wanted to not only share my life with her, but all the minor and major ups and downs of the startup too.

(Now that we're preparing for our 3rd child -- due in 2months -- I'm not sure which has more ups and downs, kids or the startup!)