I hear ya. It's very hard with a family. Also, putting together the kind of resume you need to stand out for the job you want (extracurricular, publications, unpaid internships, etc) is nearly impossible with kids and a balanced life. It's for the young and people who don't need $ for a while.
I wish I had been a lot more practical and realistic when I returned to school.
Follow what you like, but be practical. Investigate your realistic job prospects.
Glad you're back running, too!
How's your baby?