I jokingly answered "You can if your family likes two minute noodles", meaning you can survive, just, but it won't be a glamorous lifestyle!
When I married my muso husband, I was the one in a "real job", teaching Art at an inner city high School. My own art came second. Now Mr BJ has a real job, and his music is a secondary income.
I am doing OK , but with growing kids, we have had to juggle back and forth between jobs so there is always a stable income...because unless you are in a small percentage of the industry, NO-ONE I know can survive solely on their Artistic pursuits.
A tiny bit depressing, but the positives usually out way the negatives. The main plus being the amazing buzz you get when you are living a creative lifestyle. Even though there are lean months , the motivation to keep trying and not have to go back to a day job, keeps me plugging away!